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Arteries always carry blood away from the heart. They also carry only oxygenated blood except for the pulmonary artery. They have thick walls due to the pressure created.

Veins always carry blood towards the heart, they mostly carry de-oxygenated blood except for the pulmonary vein. Vein walls are not so thick.Capillaries are extremely small and its walls are only one cell thick. They join the organ to the vein or the artery, and join the pulmonary vein and pulmonary artery at the lungs.

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13y ago

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