mention the difference of : artery and vein (nature of blood)
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Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.
Arteries are thicker due to a higher and more fluctuating blood pressure. Veins are thinner. Peripheral veins have valves to keep blood flowing in one direction toward the heart. ... Arteries carry oxygenated blood away from the heart except pulmonary arteries.
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