Multiple choice general knowledge science & technology

Which of the following is referred to as the pacemaker of the heart?

  1. Sinoatrial Node

  2. Purkinje Fibers

  3. Atrioventricular Node

  4. Endocardium
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Explanation

The sinoatrial (SA) node initiates each heartbeat by generating electrical impulses that spread through the heart's conduction system, earning it the 'pacemaker' designation. The AV node delays impulses, Purkinje fibers conduct them to ventricles, and endocardium is the heart's inner lining.

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