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Preeti Dabral 3 years ago
Arteries carry blood away from the heart, and veins carry blood towards the heart. With the exception of pulmonary blood vessels, arteries carry oxygenated blood and veins carry deoxygenated blood. Arteries have thick walls with muscle tissue. Veins have thinner walls and use valves to keep your blood flowing.
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Preeti Dabral 3 years ago
Separation of oxygenated and deoxygenated blood helps in efficient supply of oxygen to the body. This system is useful in animals that have high energy requirement such as mammals and birds constantly need oxygen to get energy to maintain constant body temperature and homeostasis.
Rupali Shukla 3 years ago

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