Heart beats about ________ times in one's life.
Correct answer: A. 2.8 Billion
- A. 2.8 Billion
- B. 3.7 Billion
- C. 4.2 Billion
- D. Infinite
Explanation
A typical estimate is about 70 beats/minute x 60 minutes/hour x 24 hours/day x 365 days/year x 70 years = 2,574,720,000 beats, or about 2.6 billion beats. Since estimates vary with heart rate and lifespan, 2.8 billion is the closest listed value; students may choose 3.7 billion by using an unnecessarily high lifetime estimate.
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About Cardiac Cycle and Heartbeat
The cardiac cycle describes atrial systole, ventricular systole and diastole, including pressure changes, blood movement and the opening or closing of heart valves. It also covers the conduction pathway from the sinoatrial node through the atrioventricular node, bundle of His and Purkinje fibres, and relates these events to heartbeat sounds.
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