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These cardiac or heart muscles form a unique type of muscular tissue found only in the heart. They resemble with the skeletal muscles in being made up of striated multinucleated fibres. However, the nuclei of each fibre are not peripheral as in skeletal muscle, but are distributed within the cytoplasm. Cardiac muscles are distinctive in possessing an inherent and basic rhythmic beat (contraction and relaxation). Although the rate of beat may be regulated by nerve impulse, its independence of the nervous system has been displayed by the fact that small isolated pieces of cardiac muscle continue to contract and relax for some time.
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