The bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs; oxyhemoglobin transports oxygen to the cells of the body.Oxygenated [[haemoglobin.
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... is my answer: I would pick A; the exercising muscles. Oxygen concentrations at the muscles are low as oxygen is used up fast via respiration. So, oxyhaemoglobin becomes haemoglobin, releasing its oxygen molecules for the muscles. This happens as oxyhaemoglobin is unstable and the reaction reverses ...
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