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Cardiac muscle


1. A type of involuntary striated muscle found in the walls and histological foundation of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. These three types of muscle all form in a process known as myogenesis. The cells that comprise cardiac muscle, called cardiomyocytes or myocardiocytes, only contain one, unique nucleus. Coordinated contractions of cardiac muscle cells in the heart propel blood out of the atria and ventricles to the blood vessels of the left/body/systemic and right/lungs/pulmonary circulatory systems. This complex of actions makes up the systole of the heart. (

2. The striated and involuntary muscle of the vertebrate heart. (

3. The muscle tissue of the heart; adapted to continued rhythmic contraction. (

4. Are striated (but less distinct than skeletal muscles), and are involuntary. (

5. Tissue specialised for contraction. (

6. A striated but involuntary Muscle responsible for the pumping activity of the vertebrate heart. The individual muscle cells are joined through a junctional complex known as the intercalated disc and are not fused together into multinucleate structures as they are in skeletal muscle. (

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