The number of action potentials generated by sino-arterial node (SAN) in a healthy human is _____ per minute.
1. 120 - 140
2. 28 - 30
3. 70 - 75
4. 100 - 110
Subtopic:  Human Heart: Double Circulation |
 81%
Level 1: 80%+
NEET - 2026
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