What does the myocardium do?

The myocardium is the muscular layer of the heart. It is responsible for the pumping action of the heart, which propels blood throughout the body. The myocardium is made up of cardiac muscle cells, which are specialized muscle cells that are capable of contracting and relaxing in a coordinated fashion. The contraction of the myocardium is triggered by electrical signals from the heart's electrical system, which causes the cardiac muscle cells to contract and squeeze the blood out of the heart. The relaxation of the myocardium occurs when the electrical signal ends, allowing the heart to fill with blood again.