HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Valves in veins ____
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____ support them
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____ protect them
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____ prevent backward movement inside them
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____ make them more elastic
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Explanation:
Detailed explanation-1: -Heart valves control the flow of blood so that it moves in the right direction. The valves prevent blood from flowing backward.
Detailed explanation-2: -Medium and large veins have venous valves, similar to the semilunar valves associated with the heart, that help keep the blood flowing toward the heart. 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-3: -The one-way venous valves in deep veins prevent blood from flowing backward, and the muscles surrounding the deep veins compress them, helping force the blood toward the heart, just as squeezing a toothpaste tube ejects toothpaste.
There is 1 question to complete.