why we need veins ? what is the need of artery ?
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Veins are vessels of the circulatory system that support circulation by conveying blood to the heart. Blood flowing through the circulatory system transports nutrients, oxygen, and water to cells throughout the body.
The arteries (red) carry oxygen and nutrients away from your heart, to your body's tissues. ... They carry oxygen-rich blood away from the heart to all of the body's tissues. They branch several times, becoming smaller and smaller as they carry blood further from the heart.
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