MUSCLE PHYSIOLOGY

Detailed explanation-1: -Cardiac muscle, like skeletal muscle, is made up of sarcomeres that allow for contractility. However, unlike skeletal muscle, cardiac muscle is under involuntary control. The cardiac muscle is responsible for the contractility of the heart and, therefore, the pumping action.

Detailed explanation-2: -Unlike the skeletal muscle, the cardiac muscle is controlled by the autonomic nervous system. Action potentials in the cardiac muscle are generated by the autorhythmic cells located in the sinoatrial node of the heart.

Detailed explanation-3: -Cardiac muscle contraction occurs via the sliding filament model of contraction, much like skeletal muscle. Once calcium is bound to troponin-C and the conformational change of tropomyosin has occurred, myosin heads can bind to actin.