Approximately how many times each day do our heart valves normally open and close?
Q1. Approximately how many times each day do our heart valves normally open and close?
Answer: 100000
Explanation: At an average resting heart rate of ~70 beats/min × 60 min × 24 h ≈ 100,800 beats per day; each beat opens and closes the heart valves once, totaling ~100,000 times daily.