Which of the following blood vessels contain semilunar valves?
Correct answer: C. Veins
- A. Arteries
- B. Capillaries
- C. Veins
- D. Arterioles
Explanation
Valves in veins are one-way(semi lunar) flaps that help prevent blood from flowing backward in the circulatory system. They play a crucial role in maintaining blood flow towards the heart and preventing the backflow of blood. This mechanism is particularly important in the legs, where gravity can make it harder for blood to return to the heart, leading to conditions like varicose veins when the valves don't function properly.
This question appeared on the UHS MDCAT 2019 paper, which you can sit online with every answer explained.
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About Blood Vessels
Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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