Question

question 2 of 10
a person walks through the woods. a branch falls suddenly, almost hitting him, and his heart suddenly starts racing. what part of his nervous system causes his heart to race?
a. sympathetic
b. somatic
c. parasomatic
d. parasympathetic

Explanation:

The sympathetic nervous system is responsible for the body's "fight - or - flight" response. When a person is startled (like by a falling branch), the sympathetic nervous system activates, increasing heart rate among other responses. The somatic nervous system controls voluntary muscle movement. There is no "parasomatic" nervous system. The parasympathetic nervous system has the opposite effect of the sympathetic, promoting rest and digestion.

Answer:

A. Sympathetic