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Cardiac muscle: A type of muscle tissue that is found only in the heart and is distinguishable from the two other forms of muscle, smooth muscle (that moves internal organs, such as the bowels, and vessels, such as the artery walls) and skeletal muscle (that powers joints).ardiac muscle: A type of muscle tissue that is found only in the heart and is distinguishable from the two other forms of muscle, smooth muscle (that moves internal organs, such as the bowels, and vessels, such as the artery walls) and skeletal muscle (that powers joints).
Cardiac muscle. Definition. noun, plural: cardiac muscles. (1) The heart muscle of the vertebrates. (2) myocardium. Supplement. The muscles of the vertebrates can be classified into three major types: (1) skeletal muscle, (2) smooth muscle, and (3) cardiac muscle.he skeletal muscle is the muscle attached to the skeleton and is responsible for the voluntary movement of the skeletal system. The smooth muscle is the type of muscle found in the viscera as well as blood vessels of the vertebrates. The cardiac muscle is the muscle of the heart.