Heart rate increases at the beginning of a bout of light exercise due to______________.
A)a withdrawal of the sympathetic nervous system
B)a withdrawal of the parasympathetic nervous system
C)an increase in the outflow from the parasympathetic nervous system
D)none of the above answers are correct

Question

Quizplus · Accepted Answer

The parasympathetic nervous system regulates the heart rate at rest, and its withdrawal at the beginning of exercise leads to an increase in heart rate. Thus, choice B is the correct answer. The sympathetic nervous system is responsible for increasing heart rate during more intense exercise, so choice A is incorrect. Choice C is also incorrect because an increase in parasympathetic outflow would lead to a decrease in heart rate, not an increase.

Heart Rate Increases at the Beginning of a Bout of Light