Approximately, how many times each day do our heart valves open and close normally?
Correct answer: B. 1,00,000
- A. 10,000
- B. 1,00,000
- C. 1,50,000
- D. 2,00,000
Explanation
At an average rate of about 70 heartbeats per minute, the valves open and close roughly 100,000 times in 24 hours. The larger figures would require an abnormally high heart rate or count.
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The human body is studied through its organ systems, including digestion, respiration, circulation, excretion, nervous coordination, reproduction and immunity. Coverage also includes nutrients and deficiency diseases, hormones, blood groups, common infections, vaccines, sanitation and basic first aid, while distinguishing communicable diseases from inherited and lifestyle disorders.
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