When he wakes up in the morning,Matthew's mother turns on the overhead lights in his bedroom.Almost immediately,the ________ in his brain cause(s)a pupillary reaction that leads his pupils to dilate in the bright light.
A)superior colliculi
B)periaqueductal gray
C)red nucleus
D)inferior colliculi

Question

When he wakes up in the morning,Matthew's mother turns on the overhead lights in his bedroom.Almost immediately,the ________ in his brain cause(s)a pupillary reaction that leads his pupils to dilate in the bright light.​ 
A)superior colliculi 
B)periaqueductal gray 
C)red nucleus 
D)inferior colliculi

Quizplus · Accepted Answer

The superior colliculi are involved in visual processing, and one of their functions is to control pupil dilation in response to changes in light. When bright light is detected, the superior colliculi send signals to the muscles surrounding the pupils, causing them to dilate.

When He Wakes Up in the Morning,Matthew's Mother Turns on the Overhead