The rate of blood flow is the slowest in capillaries than other blood vessels because the:
Correct answer: D. Total cross-sectional area of the capillaries is greater than other vessels
- A. Capillaries lack valves
- B. Capillaries have one cell thick walls
- C. Resistance in blood flow is negligible in capillaries
- D. Total cross-sectional area of the capillaries is greater than other vessels
Explanation
The correct answer is that the rate of blood flow is slowest in capillaries because the total cross-sectional area of the capillaries is greater than other vessels. This increased area reduces the velocity of blood flow, allowing more time for the exchange of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues.
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About Blood Vessels
Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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