A heart beats 80 times per minute and pumps 70 cm³ of blood per beat. What is its cardiac output in dm³ per minute?
Answer and explanation
Correct answer: C. 28/5
- Step 1: Cardiac output = heart rate × stroke volume = 80 × 70 = 5600 cm³/min. Step 2. 1 dm³ = 1000 cm³, so 28/5 dm³/min. Answer: 28/5. Why not the others: 56 is what you get if you convert cm³ to dm³ with the wrong factor. 5600 is what you get if you forget to convert cm³ to dm³. 15 is what you get if you add the numbers.
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