Sinoatrial node is termed as pacemaker of the heart because it initiates the heartbeat. It is the prime nodal center of heartbeat trigger firing. Such firing mechanism is done by the specialized cells in the SA node and its membrane potential. In case of SA node suppression an alternate heartbeat firing mechanism will be taken place from Atrio ventricular (AV) node.

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Chapter 19, Problem 17BYGO

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Sinoatrial node is termed as pacemaker of the heart because it initiates the heartbeat. It is the prime nodal center of heartbeat trigger firing. Such firing mechanism is done by the specialized cells in the SA node and its membrane potential. In case of SA node suppression an alternate heartbeat firing mechanism will be taken place from Atrio ventricular (AV) node.

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