Which heart layer contains cardiac muscle cells?

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Multiple Choice

Which heart layer contains cardiac muscle cells?

The muscle responsible for pumping action is located in the middle layer of the heart wall, the myocardium. This layer is made up of cardiac muscle cells arranged to contract in a coordinated way, forming the force that ejects blood from the heart. The myocardium is thickest in the left ventricle because it must generate the high pressure needed to systemically distribute blood. The epicardium is the outer surface layer, a serous membrane that covers the heart. The endocardium lines the chambers and covers the heart valves. The pericardium is the protective double-walled sac surrounding the heart.

The muscle responsible for pumping action is located in the middle layer of the heart wall, the myocardium. This layer is made up of cardiac muscle cells arranged to contract in a coordinated way, forming the force that ejects blood from the heart. The myocardium is thickest in the left ventricle because it must generate the high pressure needed to systemically distribute blood.

The epicardium is the outer surface layer, a serous membrane that covers the heart. The endocardium lines the chambers and covers the heart valves. The pericardium is the protective double-walled sac surrounding the heart.

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