Veins allow blood to flow only towards the ______.

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Solution

Heart:
Veins carry deoxygenated blood from the other parts of the body to the heart.
Veins are thinner and accept less pressure as compared to arteries.
Since deoxygenated blood has low pressure, veins carry it to the heart, where it is pumped and converted back into oxygenated blood.
Final Answer: Veins allow blood to flow only towards the heart.

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