PATHOLOGY MCQ
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the function of valves in veins?
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To stretch and recoil to pump the blood through
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To increase surface area for exchange of materials
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To withstand high pressure
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To prevent backflow of blood
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Explanation:
Detailed explanation-1: -The valves open, allowing the blood to flow, and close, stopping the blood from flowing backwards. After running through this network of veins, blood reaches the heart and travels to the lungs, which supply it with oxygen and allow it to expel carbon dioxide and other waste.
Detailed explanation-2: -Aortic valve: Allows blood to pass from the left ventricle to the aorta; prevents backflow of blood into the left ventricle.
Detailed explanation-3: -The one-way valves in deep veins prevent blood from flowing backward. The muscles surrounding the deep veins squeeze the veins, helping force the blood toward the heart, just as squeezing a toothpaste tube ejects toothpaste.
There is 1 question to complete.