Which layer of the heart contains muscle fibers that contract to pump blood?

Name: Which layer of the heart contains muscle fibers that contract to pump blood?
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Question

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The myocardium is the middle layer of muscle fibers of the heart that contract to pump blood.The endocardium is the lining of the inner surface of the heart chambers,the epicardium is the outer layer of the heart muscle,and the pericardium is the membranous sac that surrounds the heart.

Which Layer of the Heart Contains Muscle Fibers That Contract