In bright light, the _____ muscle of the iris contracts, causing a/an _____ (increase/decrease) in the size of the pupil (constriction).
A) sphincter pupillae; increase
B) dilator pupillae, decrease
C) ciliary, decrease
D) sphincter pupillae; decrease

Question

Quizplus · Accepted Answer

In bright light, the sphincter pupillae muscle contracts, leading to a decrease in the size of the pupil, a process known as constriction. This helps to reduce the amount of light entering the eye, protecting it from excessive brightness.

In Bright Light, the _____ Muscle of the Iris Contracts