Pupil diameter
A)does not change.
B)adjusts to the temperature of the external environment.
C)responds only to the amount of light present in the environment.
D)responds to the amount of light present in the environment as well as the organism's emotional state.

Question

Pupil diameter​ 
A)does not change. 
B)adjusts to the temperature of the external environment. 
C)responds only to the amount of light present in the environment. 
D)responds to the amount of light present in the environment as well as the organism's emotional state.

Quizplus · Accepted Answer

Pupil diameter not only responds to the amount of light present in the environment but also to the organism's emotional state. For example, the pupils may dilate when a person is excited or afraid, even in a well-lit environment.

Pupil Diameter​

Pupil Diameter