The heart of a mammal is.....

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(A) The heart of a mammal is myogenic. In a myogenic heart,the heartbeat is initiated by a specialized group of muscle cells called the sinoatrial nod

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Myogenic

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(A) The heart of a mammal is myogenic. In a myogenic heart,the heartbeat is initiated by a specialized group of muscle cells called the sinoatrial node ($SA$ node) or pacemaker,which is located within the heart muscle itself. This is in contrast to a neurogenic heart,where the heartbeat is initiated by nerve impulses from the central nervous system.

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