After completing a race, a runner's heart rate begins to decelerate. Which of the following is responsible for this?
A)adrenaline
B)sympathetic nervous system
C)parasympathetic nervous system
D)epinephrine
E)norepinephrine

Question

Quizplus · Accepted Answer

The parasympathetic nervous system is responsible for slowing down the heart rate after physical exertion. Adrenaline, epinephrine, and norepinephrine are all involved in increasing heart rate and blood pressure during physical activity.

After Completing a Race, a Runner's Heart Rate Begins to Decelerate