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Aqa A Level Biology Paper 2
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AQA A LEVEL BIOLOGY PAPER 2 The iris in the human eye is a muscular structure. The iris changes the size of the pupil. Figure 1 shows the muscles in the iris. Figure 1 . 1 Suggest and explain how the interaction between the muscles labelled in Figure 1 could cause the pupil to constrict (narrow). [2 marks] S - The Marketplace for Revision Notes & Study Guides 3 . The fovea of the eye of an eagle has a high density of cones. An eagle focuses the image of its prey onto the fovea. Explain how the fovea enables an eagle to see its prey in detail. Do not write outside the box Do not refer to colour vision in your answer.
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