The primary function of the _____ is to supply the blood with oxygen so that the blood can deliver oxygen to all parts of the body.
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Correct answer is respiratory system.
The primary function of the reparatory system is to supply the blood with oxygen so that the blood can deliver oxygen to all parts of the body.
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.