An increase in parasympathetic outflow to the heart results in
A) an increase in HR.
B) a decrease in HR.
C) a slight increase in arterial blood pressure.
D) a slight decrease in arterial blood pressure followed by an increase in HR.

Question

Quizplus · Accepted Answer

An increase in parasympathetic outflow to the heart results in a decrease in heart rate (HR) due to the activation of the vagus nerve, which releases acetylcholine, causing the SA node to fire at a slower rate. It does not cause a significant change in arterial blood pressure.

An Increase in Parasympathetic Outflow to the Heart Results in