All the components of the conducting system c | vedclass

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(C) The heart's conducting system consists of the $SA$ node,$AV$ node,Bundle of His,and Purkinje fibers. While all these components are capable of gen

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The sino-atrial node has a higher inherent rate of depolarisation.

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(C) The heart's conducting system consists of the $SA$ node,$AV$ node,Bundle of His,and Purkinje fibers. While all these components are capable of generating action potentials (auto-excitability),the $SA$ node is the primary pacemaker. This is because the $SA$ node possesses the highest inherent rate of depolarization,approximately $70-75$ beats per minute. Since it reaches the threshold for an action potential faster than any other part of the conducting system,it initiates the heartbeat and sets the rhythm for the rest of the heart.

All the components of the conducting system can generate an action potential for the contraction of heart muscle,but the Sinoatrial node acts as the pacemaker because

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$A$: The cardiac impulse which originates from $SA$ node in mammalian heart cannot spread directly from atria to ventricles.
$R$: In mammalian heart there is no continuity between cardiac muscle fibres of atria and those of ventricles except $AV$ bundles.

$A$ specialised nodal tissue embedded in the lower corner of the right atrium,close to the atrioventricular septum,delays the spreading of impulses to the heart apex for about $0.1 \; sec$. This delay allows:

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