Involuntary Cardiac Muscle Fibers of the Heart are Innervated by ________

Question

Involuntary cardiac muscle fibers of the heart are innervated by ________.
A) sensoriganglionic fibers
B) preganglionic fibers
C) somatic motor fibers
D) visceral motor fibers
E) All of the answers are correct.

Accepted Answer

Involuntary cardiac muscle fibers of the heart are innervated by visceral motor fibers. Somatic motor fibers control voluntary skeletal muscles, while sensoriganglionic fibers and preganglionic fibers are part of the autonomic nervous system but do not innervate the heart.