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Which of the following statements is incorrect ?A. Veins are typically larger in diameter than arteriesB. Because of their small size, blood flows more rapidly in capillaries than in other parts of circulatory systemC. Wall of arteries are elastic enabling them to stretch and shrink during changes in blood pressureD. Veins contain more blood than any other part of circulatory system |
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Answer» Correct Answer - B On an average, capillaries are about 1 mm long and 8 mm in diameter. Although each capillary is very narrow, there are so many of them that the capillaries have the greatest total cross-sectional area of any other type of vessel. Consequently, the blood decreases in velocity as it passes through the capillary beds, allowing more time for it to exchange materials with the surrounding extracellular fluid. Blood also loses most of its pressure in passing through the vast capillary networks and so is under very low pressure when it enters the veins. |
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