biology mod 1

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tough outer layer of the eye?
the sclera
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transparent part at the frount of the eye?
the cornea
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the lense is held by the?
suspensory ligaments and ciliay muscles
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muscle that controls the size of the pupil?
the iris
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what does the cornea do?
refracts light as it enters the eye
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the function of the iris?
controls the amount of light that enters the eye
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lens function
focuses light onto the retina
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retina function
contains light sensitive cells
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the optic nerves function?
carries impulses from the eye to the brain
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what causes long sightedness
the lens focuses the sharpest image behing the retina not on it
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what cause short sightedness
the retina focuses the sharpest image in frount of the retina not on it
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explain the reflex arc
receptor detects a stimulus - change in the environment ,sensory neurone sends signal to relay neurone ,motor neurone sends signal to effector, effector produces a response
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describe accommodation when a object is distant
when an image is distant the ciliary muscles relax and the suspensary ligaments stretch
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when an objectis close up describe accommodation
when an image is close up the suspensary ligaments slacken and the cilary muscles contract
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how can short sighted be corrected
by using a concave lens
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how is long sighted corrected
using a convex lens
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Other cards in this set

Card 2

Front

transparent part at the frount of the eye?

Back

the cornea

Card 3

Front

the lense is held by the?

Back

Preview of the front of card 3

Card 4

Front

muscle that controls the size of the pupil?

Back

Preview of the front of card 4

Card 5

Front

what does the cornea do?

Back

Preview of the front of card 5
View more cards

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