To carry oxygen to the rest of the cells in the body.
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to run oxygen through out the whole body. that's whey we have veins through our legs, head, arms etc. because the streams carry cells that are carrying oxygen, they are blue while in the body, but when cut open, they turn red because the oxygen is released and the cells die
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To carry oxygen from the lungs to the rest of the body.
Red blood cells have haemoglobin, that picks up oxygen, then releases it to the cells.
Red blood cells have haemoglobin, that picks up oxygen, then releases it to the cells.
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To carry oxygen AND other nutrients to the rest of the cells in your body. Oxygen, vitamins, water, proteins, etc.
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To carry oxygen by using the hemoglobin protein.