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Double Pump System
Right side pumps blood to the lungs; left side pumps blood to the rest of the body.
Arteries (Structure & Function)
Thick, elastic walls to withstand high blood pressure as blood flows away from the heart.
Veins (Structure & Function)
Thin walls with valves to prevent backflow as low-pressure blood returns to the heart.
Capillaries (Structure & Function)
One-cell-thick walls to allow rapid gas and nutrient exchange with body cells.