Understanding Responses in the Human Eye and Ear

Explore the functions of the semi-circular canals and cochlea in the human eye and ear system. Test your knowledge with interactive quizzes and learn about how these components play a crucial role in our sensory perception.

• Human Eye
• Human Ear
• Sensory Perception
• Interactive Quizzes

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1. 3.5.3 Responses in the Human Eye and Ear Follow-Me iQuiz

2. Q. What is the function of the semi-circular canals? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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4. Q. What is the function of the cochlea? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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6. Q. What is connected to the middle ear by the Eustachian tube? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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8. Q. What surrounds the bones in the middle ear? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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10. Q. Name two sense organs, other than the ear and the eye, in the human body. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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12. Q. What is the function of the lens of the eye? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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14. Q. What is the function of the retina of the eye? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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16. Q. Outline the role of the suspensory ligaments in vision. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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18. Q. Outline the role of the cones in vision. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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20. Q. Outline the role of the optic nerve in vision. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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22. Q. Outline the role of the brain in vision. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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24. Q. Explain how the iris works. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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26. Q. Suggest a reason why two eyes are better than one. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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28. Q. In which part of the ear are nerve impulses generated? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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30. Q. In which part of the eye are nerve impulses generated? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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32. Q. Suggest one way by which the ear may be protected. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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34. Q. The hammer (malleus) is a very small bone located in the ... Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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36. Q. Which is present in the middle ear, gas or liquid? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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38. Q. In which part of the eye would you find rods and cones? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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40. Q. What is the function of the Eustachian tube? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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42. Q. TRUE or FALSE. The semi-circular canals in the ear are involved in balance. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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44. Q. Name the coloured part of the eye. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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46. Q. What is the function of the pupil in the eye? Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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48. Q. Name the type of chemical that carries messages between two neurons. Equalise pressure on the eardrum Air Iris Equalise pressure on the eardrum Air Iris Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Muscular contraction in response to light intensity, pupil size changes, allows more or less light in Allow light in FALSE TRUE Allow light in FALSE TRUE Focus light onto the retina Balance Focus light onto the retina Balance Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Brings impulses from retina; Brings impulse to brain Gas Neurotransmitter Cochlea or semi-circular canals Hearing Retina Cochlea or semi-circular canals Hearing Retina Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Holds lens in place; Changes shape of lens Convert light into nerve impulses; Image forms on it Skin; Tongue; Nose Skull/bone; Wax; Wear ear protection; Avoid noisy environments Detect colour Increased visual field; Judge distance (depth); 3D vision Skull/bone; Wax; Wear ear protection; Avoid noisy environments Increased visual field; Judge distance (depth); 3D vision Detect colour Ear Throat Interprets information received from retina Interprets information received from retina Ear Throat

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