The middle layer of the heart is the:
A)endocardium.
B)myocardium.
C)epicardium.
D)pericardium.

Question

Quizplus · Accepted Answer

The middle layer of the heart is the myocardium, which is composed of cardiac muscle cells responsible for the contraction of the heart. The endocardium is the innermost layer lining the chambers and valves of the heart, while the epicardium is the outermost layer covering the heart. The pericardium is a sac-like structure that surrounds the heart and contains a small amount of fluid to reduce friction during heartbeats.

The Middle Layer of the Heart Is The