Which type of blood vessels have door like structures that prevent the backflow of the blood?
A
Veins
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B
Arteries
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C
Capillaries
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D
Aorta
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Solution
The correct option is A Veins Veins are blood vessels which bring back blood from the body to the heart.
The blood passing through the veins is deoxygenated (except in pulmonary veins) and flows at a low pressure. Therefore, veins have valves to prevent the backflow of blood.