The total area of cross-section is $0.25\,m^2$. If the blood is flowing at the rate of $100\, cm^3/sec$, then the average velocity of flow of blood through the capillaries is ........ $mm/sec$
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Rate of flow $\mathrm{Q}=\mathrm{Av}$
$\mathrm{v}=\frac{\mathrm{Q}}{\mathrm{A}}=\frac{100 \times 10^{-6}}{0.25}=4 \times 10^{-4} \mathrm{m} / \mathrm{s}$
$=0.4\, {mm} / \mathrm{s}$
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