A patient has a heart rate of 72 beats per minute and a stroke volume of 70 mL per beat. What is the approximate cardiac output?
Correct answer: B. 5.0 L/min
- A. 0.5 L/min
- B. 5.0 L/min
- C. 50.4 L/min
- D. 142 L/min
Explanation
Cardiac output equals heart rate multiplied by stroke volume: 72 × 70 mL equals 5,040 mL per minute, or approximately 5.0 L/min. The result must be converted from millilitres to litres.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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