ReNEET 2026 · Biology · Q115Body Fluids and CirculationIn our bank: Strong match · 88%
The number of action potentials generated by the sino-atrial node (SAN) in a healthy human is _______ per minute.
- A.28 - 30
- B.70 - 75✓
- C.100 - 110
- D.120 - 140
Correct Answer
(B) 70 - 75
Solution & Explanation
The SA node is the pacemaker; it generates the maximum number of action potentials, about 70–75 per minute, and is thus responsible for the normal resting heart rate (~72 beats/min).
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