Homeostasis & Response

Question 1

Explain the response that occurs when moving into a poorly-lit room.

Answer 1

The radial muscles contract and the circular muscles relax, causing the pupil to become wider.

Question 2

Explain the response that occurs when looking at a tree far in the distance.

Answer 2

The ciliary muscles relax, causing the suspensory ligaments to contract. This makes the lens become less round (thin) and so the light refracts less.