Question

question 3 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. parasomatic

c. parasympathetic

d. somatic

Explanation:

The sympathetic nervous system activates the "fight - or - flight" response. In this scenario, the sudden event (branch almost hitting) is a stressor. The sympathetic nervous system causes physiological changes like an increased heart rate (heart racing) to prepare the body for a potential threat. The parasympathetic nervous system is for "rest - and - digest" (opposite of the described effect). The somatic nervous system controls voluntary movements. "Parasomatic" is not a standard part of the nervous system classification.

Answer:

A. Sympathetic