In dim light, the ________ muscles of the iris are stimulated to contract, resulting in __________ of the pupil.
A) radial; dilation
B) circular; dilation
C) radial; constriction
D) circular; constriction

Question

Quizplus · Accepted Answer

In dim light, the radial muscles of the iris are stimulated to contract, which results in the dilation of the pupil to allow more light to enter the eye.

In Dim Light, the ________ Muscles of the Iris Are