Question

What is the stroke volume of an adult human heart?

• A. 50 ml
• B. 70 ml
• C. 90 ml
• D. 100 ml

Answer 1

Answer: (B)

Cardiac output = Stroke volume $\times$ Heart beats per minute.
Cardiac output is the amount of blood pumped by heart per minute. Human heart beats for about 72 times per minute. Cardiac output is about 5L.
$\therefore$ Stroke volume $=\frac{\text{Cardiac output}}{\text{Heart beats per minute}}$
$=\frac{5040}{72}=70ml$