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)
A) effector.
B) control center.
C) receptor.
D) positive feedback.

Question

Quizplus · Accepted Answer

The iris muscles act as effectors because they respond to the stimulus (bright light) by contracting to decrease the pupil size, which is the action taken to maintain homeostasis.

When You Are Exposed to Bright Light, a Reflex Is