The bulk of the structure of the heart consists of the

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Quizplus · Accepted Answer

The myocardium is the middle layer of the heart wall and is responsible for the contraction of the heart, which pumps blood throughout the body. The epicardium is the outer layer of the heart wall, the endocardium is the inner layer that lines the chambers and valves, and the pericardium is the sac that surrounds and protects the heart. While these structures are important components of the heart, they do not make up the bulk of its structure like the myocardium does.

The Bulk of the Structure of the Heart Consists of the