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Abhishek Tiwari

Teaching Exams
Science
2 years ago

what is vein

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Abhishek Mishra

2 years ago

Veins are thin-walled structures inside of which a set of valves keeps blood in the body flowing in one direction. The heart pumps oxygen-rich blood to the body's tissues through thicker-walled arteries; the veins return that blood to the heart.

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