All the components of the nodal tissue are au | vedclass

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(D) The nodal tissue of the heart is autoexcitable,meaning it can generate action potentials without external stimuli.However,the rate of generation o

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$SA$ node has the highest rate of depolarisation.

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(D) The nodal tissue of the heart is autoexcitable,meaning it can generate action potentials without external stimuli.However,the rate of generation of action potentials varies among different components of the nodal tissue.The $SA$ node (Sinoatrial node) has the highest rate of depolarisation,generating approximately $70-75$ action potentials per minute.Because it initiates the impulse faster than any other part of the conduction system (like the $AV$ node or Purkinje fibers),it sets the pace for the entire heart.Therefore,the $SA$ node acts as the natural pacemaker of the heart.

Column-$I$	Column-$II$
$a$. Superior Vena Cava	$p$. Carries deoxygenated blood towards the lungs
$b$. Inferior Vena Cava	$q$. Carries oxygenated blood away from the lungs
$c$. Pulmonary Artery	$r$. Brings deoxygenated blood from lower body parts to the right atrium
$d$. Pulmonary Vein	$s$. Brings deoxygenated blood from upper body parts to the right atrium

All the components of the nodal tissue are autoexcitable. Why does the $SA$ node act as the normal pacemaker?

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