If the stroke volume is 70 cm3 and the heart rate is 72 beats per minute, the cardiac output is about
Correct answer: A. 5 dm3 per minute
- A. 5 dm3 per minute
- B. 0.5 dm3 per minute
- C. 14 dm3 per minute
- D. 50 dm3 per minute
Explanation
Cardiac output is stroke volume multiplied by heart rate, so 70 cm3 times 72 gives 5,040 cm3 per minute, which is about 5 dm3. That figure is close to the total blood volume of an adult, meaning the whole circulation passes through the heart roughly once every minute at rest. During heavy exercise both factors rise and the output can reach five times this value.
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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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