Realizing that you did not study as much as you needed to for this exam, you start to take the test. However, it is difficult to concentrate because your heart is racing, your stomach seems tied in a knot, you are breathing too quickly, and your mouth is dry.
Most likely, you are experiencing the effects of the .

A) parasympathetic nervous system
B) sympathetic nervous system
C) somatic nervous system
D) central nervous system

B. sympathetic nervous system

Explanation:

This is a type of the Autonomic nervous system. The sympathetic nervous system is responsible for the body's fast involuntary response to dangerous or stressful situations. This response is usually exhibited by a flash flood of hormones being released into the bloodstream to boosts the body's alertness and heart rate thereby sending extra blood to the muscles.

These signs such as difficulty in concentrating,increase in heartbeat, stomach seeming tied in a knot, heavy breathing , dry mouth tells when someone is in a very tensed situation.

answer; chemical substances that affect our psychological state;