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The natural PACEMAKER of the human heart is the:
ASA node (sinoatrial node, in right atrium)
BAV node (atrioventricular node, between atria and ventricles)
CBundle of His (in the interventricular septum)
DPurkinje fibres (in ventricular walls)
Answer & Solution
Correct answer: A. SA node (sinoatrial node, in right atrium)
The SA NODE (sinoatrial node) in the right atrium is the heart's natural pacemaker, generating ~70 impulses/min. AV node delays the impulse; Bundle of His + Purkinje conduct to ventricles.
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