The heart is
A)sympathetically innervated via cardiac nerve fibers
B)parasympathetically innervated by vagus nerve fibers
C)only partly innervated by the somatic nervous system
D)innervated by only the sympathetic division of the autonomic nervous system
E)both a and b

Question

Quizplus · Accepted Answer

The heart is both sympathetically innervated via cardiac nerve fibers and parasympathetically innervated by vagus nerve fibers. This means that both the sympathetic and parasympathetic divisions of the autonomic nervous system have a role in controlling heart function. The somatic nervous system, on the other hand, only has a limited role in controlling the heart, primarily during exercise when the body requires increased blood flow. So, choices A, B, and D are incorrect.

The Heart Is