SAN can generate impulses at a rate of: | vedclass

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(A) The heart exhibits auto-rhythmicity,which is the ability to contract spontaneously. The mammalian heart is myogenic,meaning the heartbeat originat

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$70-75\; min^{-1}$

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(A) The heart exhibits auto-rhythmicity,which is the ability to contract spontaneously. The mammalian heart is myogenic,meaning the heartbeat originates from an electrical potential wave called a cardiac impulse,which arises from the sinoatrial node $(SAN)$ and spreads across the cardiac chambers.The $SAN$ is located in the wall of the right atrium near the opening of the superior vena cava and generates impulses at a rate of approximately $70-75$ times per minute.From the $SAN$,the cardiac impulse travels to the atrioventricular node $(AVN)$,then passes to the $AV$ bundle (Bundle of His) and its branches,finally reaching the Purkinje fibers in the ventricles.The Bundle of His provides the only route for the transmission of the excitation wave from the atria to the ventricles. Purkinje fibers conduct these impulses significantly faster than the surrounding cells,ensuring that the heart muscle contracts in the most efficient manner.

$SAN$ can generate impulses at a rate of:

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