Question

Maximum surface area of circulating system is seen in

• A. heart
• B. capillaries
• C. arterioles
• D. veins

Answer 1

Answer: (B)

capillaries

Answer 2

Capillaries form the microcirculation network in human body. They are less than $100 \,\mu m$ in diameter. Capillary microcirculation provides a total surface area of approximately $700 \,m^2$ for exchange of gases between the circulator) system and the interstitial compartment. Under basal conditions $1 - 10\%$ of capillaries are functional at any time.