The greatest bulk of the heart wall consists of _______, the cardiac muscle that contracts to pump the blood.
A) myocardium
B) endocardium
C) pericardium
D) septum

Question

Quizplus · Accepted Answer

The myocardium is the middle layer of the heart wall and it consists of thick, muscular tissue composed mainly of cardiac muscle fibers. It is responsible for contracting to pump blood throughout the body. The endocardium is the inner lining of the heart, and the pericardium is the outer covering of the heart. The septum is a wall-like structure that divides the heart into left and right sides.

The Greatest Bulk of the Heart Wall Consists of _______