The eye

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Question 51

Figure 1 shows a cross-sectional diagram of the human eye with several structures labelled.

A simplified cross-sectional diagram of the human eye. Label A points to the outer transparent layer at the front of the eye (cornea). Label B points to the lens suspended behind the pupil. Label K points to the colored muscular ring (iris). Label Y points to the tissue layer lining the back of the eye (retina). Label Z points to the nerve at the back of the eye (optic nerve).

Explain how structure K controls the amount of light entering the eye when a person moves into a brightly lit room.

[2]

The eye

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Question 51

Figure 1 shows a cross-sectional diagram of the human eye with several structures labelled.

A simplified cross-sectional diagram of the human eye. Label A points to the outer transparent layer at the front of the eye (cornea). Label B points to the lens suspended behind the pupil. Label K points to the colored muscular ring (iris). Label Y points to the tissue layer lining the back of the eye (retina). Label Z points to the nerve at the back of the eye (optic nerve).

Explain how structure K controls the amount of light entering the eye when a person moves into a brightly lit room.

[2]

The eye

Question 51

The eye Questions

The eye

Question 51

The eye Questions