MEDICAL PHYSIOLOGY

Detailed explanation-1: -The heart muscle is the myocardium or middle layer of the heart walls. The myocardium is responsible for the contractile function of the cardiac pump.

Detailed explanation-2: -The myocardial layer contains the contractile elements of the heart. The bundles of striated muscle fibres present in the myocardium are arranged in a branching pattern and produce a wringing type of movement that efficiently squeezes blood from the heart with each beat.

Detailed explanation-3: -The sliding of actin and myosin past each other produces the formation of “cross-bridges, ‘’ which causes contraction of the heart and generation of force.

Detailed explanation-4: -Myocardium. The middle layer of the heart wall is the myocardium-the muscle tissue of the heart and the thickest layer of the heart wall. It is composed of cardiac muscle cells, or cardiomyocytes. Cardiomyocytes are specialized muscle cells that contract like other muscle cells, but differ in shape.