The SA node is innervated by the
A) sympathetic nervous system only.
B) somatic nervous system only.
C) parasympathetic nervous system only.
D) sympathetic and parasympathetic nervous systems.
E) sympathetic, parasympathetic, and somatic nervous systems.

Question

Quizplus · Accepted Answer

The SA node, or sinoatrial node, is innervated by both the sympathetic and parasympathetic nervous systems. The sympathetic nervous system increases heart rate, while the parasympathetic nervous system decreases it.

The SA Node Is Innervated by the