At a heart rate of 75 beats per minute, one complete cardiac cycle lasts about
Correct answer: D. 0.8 second
- A. 0.1 second
- B. 0.4 second
- C. 1.2 seconds
- D. 0.8 second
Explanation
Sixty seconds divided by 75 beats gives 0.8 second per cycle, of which atrial contraction takes about 0.1, ventricular contraction 0.3 and the shared relaxation the rest. This arithmetic is a standard MDCAT calculation.
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About Human Heart
The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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