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Oxygen rich blood is physically transported by arteries; which lead away from the heart. Oxygen depleted blood is transported back to the heart by veins.

Arteries are bigger than veins and are set deeper within the body.

Within the veins and arteries are red blood cells that technically "carry" the oxygen.

Red blood cells are composed of the protein haemoglobin which is rich in iron.

It is the iron that enables the red blood cells to "carry" the oxygen by forming a chemical bond with the oxygen atom.

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