HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which statement about capillaries is FALSE?
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They are numerous.
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They decrease surface area.
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They allow for blood cells to move in a single file.
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They are the blood vessel where gases and nutrients are exchanged.
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Explanation:
Detailed explanation-1: -If the ambient temperature is higher than the temperature in the capillaries, the body will open precapillary sphincter to increase the number of capillary beds. This increases the overall capillary surface area, allowing for increased heat transfer through convection.
Detailed explanation-2: -Capillaries have the largest total cross-sectional and surface area. Veins are thin-walled blood vessels that return deoxygenated blood to the heart. Sinusoids are substitutes for capillaries in some organs such as the spleen, liver, red bone marrow, etc.
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