The second layer of the wall of the heart, the ____, makes up the bulk of the heart.
A) epicardium
B) myocardium
C) endocardium
D) pericardium

Question

The second layer of the wall of the heart, the ____, makes up the bulk of the heart.​
A) ​epicardium
B) ​myocardium
C) ​endocardium
D) ​pericardium

Quizplus · Accepted Answer

The myocardium is the middle layer of the heart wall and is responsible for the contraction of the heart. It is composed of cardiac muscle cells and makes up the bulk of the heart. Options A, C, and D refer to other layers of the heart wall, but do not make up the bulk of the heart.

The Second Layer of the Wall of the Heart, the ____