Most of the middle layer in the heart wall is composed of
A) cardiac muscle cells.
B) chondrocytes.
C) epithelial cells.
D) fibrocytes.
E) smooth muscle cells.

Question

Quizplus · Accepted Answer

The middle layer in the heart wall is known as the myocardium, and it is composed mainly of cardiac muscle cells. These specialized muscle cells contract and relax to cause the heart to beat and pump blood throughout the body.

Most of the Middle Layer in the Heart Wall Is