Question

Which statement about the mammalian circulatory system is correct?

• A. The average diameter of arteries is greater than that of veins.
• B. The order of decreasing velocity of blood flow is arteries > capillaries > veins.
• C. The total surface area of the capillaries is considerably greater than that of all of the arteries, arterioles, venules and veins combined.
• D. The electrical activity that coordinates the heating of the heart originates in the atrio- ventricular node.

Answer 1

Answer: (C)

Correct answer is (c) The total surface area of the capillaries is considerably greater than that of all of the arteries, arterioles, venules and veins combined.