Haemoglobin in the blood carries oxygen from the lungs to the rest of the body where it releases the oxygen to burn nutrients to provide energy to power the functions of the organism, and collects the resultant carbon dioxide.
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Haemoglobin in the blood carries oxygen from the lungs to the rest of the body where it releases the oxygen to burn nutrients to provide energy to power the functions of the organism, and collects the resultant carbon dioxide.