Discussion
The cardiac output is calculated by the formula :
Answer: A
Cardiac output is stroke volume × heart rate per minute.
Cardiac output is the volume of blood the heart pumps each minute. Stroke volume is the volume ejected by the left ventricle in one beat.
\[ \begin{aligned} \text{CO} &= \text{SV} \times \text{HR} \\ &= 70\ \text{ml} \times 72\ \text{/min} \\ &\approx 5\ \text{L/min} \end{aligned} \]
Respiratory rate concerns breathing, not the heart. End-systolic and end-diastolic volumes are used to work out stroke volume itself (EDV minus ESV), so multiplying stroke volume by either of them gives no meaningful output.
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