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Question

Choose the correct answer from the alternatives given.
A vein differs from an artery in having

A
strong muscular walls
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B
valves to control the direction of flow of blood towards the heart
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C
valves to control the direction of flow of blood opposite to the heart
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D
narrow lumen
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Solution

The correct option is B valves to control the direction of flow of blood towards the heart
Veins are less muscular than arteries, contain valves to help keep blood flowing in the right direction, towards the heart. They carry deoxygenated blood from tissues back to the heart.
So, the correct option is 'valves to control the direction of flow of blood towards the heart'.

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