5.2 The human nervous system

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Question 1
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Figure 1 shows a cross-section of a human eye with a vision defect.

Figure 1 shows a cross-section of a human eye. Labels X and Y point to parts of the eye. Label X points to the clear outer layer at the very front of the eye (cornea). Label Y points to the muscle ring attached to the suspensory ligaments (ciliary muscles). Light rays originating from a near object are shown passing through the front of the eye and the lens, and converging at a focal point that lies behind the retina at the back of the eyeball. Marks indicate the path of the light rays.

a.

Label structures X and Y on Figure 1.

Choose answers from the box:

  • cornea

  • iris

  • ciliary muscles

  • retina

  • optic nerve

  • Structure X: __________

  • Structure Y: __________

[2]
b.

Complete the following sentences about how a normal eye focuses on a distant object.

Choose the answers from the options in the brackets:

  1. To focus on a distant object, the ciliary muscles [contract / relax] __________.
  2. This causes the lens to become [thicker / thinner] __________.
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c.

  1. Using Figure 1, give the reason why this person cannot see a near object clearly.

  2. Give one way, other than wearing spectacles, that this vision defect can be corrected.

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5.2 The human nervous system Questions

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