HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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These have structures that prevent backflow of blood
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arteries
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veins
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Venous valves are especially important in the arms and legs, where they prevent the backflow of blood in response to the pull of gravity.
Detailed explanation-2: -The blood passing through the veins is deoxygenated (except in pulmonary veins) and flows at a low pressure. It flows slow and steady against the direction of gravity. Therefore, veins have valves to prevent the backflow of blood.
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