Question

(a)
Write the function of each of the following parts of human
(1) Cornea (i) Iris (iii) Crystalline lens (iv) Ciliary muscles
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Answer 1

Answer:

1. Cornea - it provides 67 % of eye's focusing power.

2. Iris - It controles the size of the pupil.

3. Crystalline lens - it is the central part of the eye that faciliates the image formation.

4. Cilliary Muscles- They hold the lens in position and help in modifying the curvature of the lens.

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Answer 2

Cornea

It function like window that control the focuses the entry of the light into the eye.

Iris

the Iris is a contractile structure consisting mainly smooth muscle surrounding the puil.

Crystalline lens

the crystalline lens provide approximately one- third of the focusing power of the eye. the lens is the flexible and its curavature can change the influence of the ciliary body.

Ciliary muscle

a circular muscle that relaxes or tightens the zonules fibres that hold lens to change shape of focusing.