BRAINCAKECardiac Muscle
Cardiac muscle is found only in the walls of the heart. It is involuntary, which means it is not under conscious control, and it is myogenic: it contracts and relaxes rhythmically without needing stimulation from nerves. Each heartbeat is started by the sinoatrial node (SAN), a patch of specialised tissue in the wall of the right atrium.
Cardiac muscle cells are branched and interconnected. Each cell usually has one nucleus and shows faint cross-striations, because it contains actin and myosin filaments arranged in sarcomeres, as in skeletal muscle.
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