What are veins,valves ?
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Deoxygenated blood is pumped through a series of veins and venous valves. As the leg muscles are activated (contract) the valves in the veins open to allow blood to flow back towards the heart. Each valve has two opposed flaps that act like gates opening in one direction stopping blood from moving back down the leg.
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Veins are a type of blood vessel that return deoxygenated blood from your organs back to your heart. These are different from your arteries, which deliver oxygenated blood from your heart to the rest of your body. Deoxygenated blood that flows into your veins is collected within tiny blood vessels called capillaries.
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