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The circulatory system delivers oxygen and nutrients to cells and removes waste through arteries, capillaries, and veins. Arteries carry oxygenated blood away from the heart with thick muscular walls. Capillaries are the smallest blood vessels that connect arteries and veins and allow diffusion of molecules to tissues. Veins carry deoxygenated blood back to the heart, having valves to prevent backflow and thicker walls than arteries. Together this system circulates blood throughout the body to sustain life.

Author

Perry Sin

Language

EN