Each of these tissue categories has distinctive cell shapes and functions.
Muscle tissue is responsible for locomotion and for the movements of the various parts of the body with respect to one another. There are three categories of muscle tissue: skeletal, cardiac, and smooth_muscle. Another term for skeletal muscle is striated muscle. The term visceral is often used as a synonym for smooth muscle.
(1) Cardiac muscle is associated only with the heart. It forms the bulk of the heart wall.
(2) The muscle of the heart wall is referred to as the myocardium of the heart.