Biology · Heart Beat
From which specific structure within the human heart does the rhythmic contraction normally originate?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Sinoatrial (SA) node✓
- 2Atrioventricular (AV) node
- 3Purkinje fibers
- 4Bundle of His
Correct answer
Sinoatrial (SA) node
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