Biology · Nodes of the Heart

Why is the Sinoatrial (SA) node commonly referred to as the natural pacemaker of the heart?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1It controls the mechanical closure of the atrioventricular valves.
2It is capable of generating rhythmic action potentials that initiate heartbeats.✓
3It delays the cardiac impulses coming from the ventricles.
4It regulates the flow of oxygenated blood to the lungs.

Correct answer

It is capable of generating rhythmic action potentials that initiate heartbeats.

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