When blood has been pumped out the left ventricle of the heart, it begins to make its journey around the body in an artery called aorta. This blood contains oxygen
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Oxygen is carried by the haemoglobin molecule within red blood cells.
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The oxygenleaves the red blood cells as they pass through capillaries.
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Capillaries are the network of blood vessels which pass between the cells in the body.
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As blood leaves the capillaries it enters the veins.Veins return blood to the heart
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As bloodleaves the capillaries it enters the veins.