When you are exposed to bright light,a reflex is initiated and the muscles of your iris contract to decrease your pupil size.The iris muscles are acting as a(n)

Question

Quizplus · Accepted Answer

The iris muscles are responding to the stimulus of bright light by contracting to decrease the size of the pupil, which is the effector in this reflex. The control center would be the nervous system that is initiating the reflex, and the receptor would be the cells in the retina that detect the bright light. Positive feedback would not apply in this situation, as the response is meant to counteract the stimulus rather than amplify it.

When You Are Exposed to Bright Light,a Reflex Is Initiated