The Thickest Layer of the Heart Is The

Multiple Choice

The thickest layer of the heart is the:

A) pericardium, the outermost layer, which is a fibrous membrane.
B) myocardium, the middle layer, which is the muscular layer.
C) endocardium, the outermost layer, which is the smooth outer surface of the heart.
D) epicardium, the innermost layer, which is watertight and prevents leakage of blood out into the other layers.