Question

the ______ nervous system is responsible for responses such as pupil dilation, increased heart rate, and increased respiration.

a. autonomic
b. parasympathetic
c. somatic
d. sympathetic

Explanation:

The sympathetic nervous system activates the body's "fight - or - flight" response, which includes pupil dilation, increased heart rate, and increased respiration. The autonomic nervous system has two main divisions (sympathetic and parasympathetic), but the specific responses mentioned are characteristic of the sympathetic division. The somatic nervous system controls voluntary muscle movement and is not related to these involuntary responses. The parasympathetic nervous system has the opposite effect, promoting "rest - and - digest" functions.

Answer:

D. sympathetic