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When saturated with oxygen it is called oxyhaemoglobin and is a bright red colour. After haemoglobin releases oxygen to the body tissues, it reverses its function and picks up carbon dioxide, the principal product of tissue respiration, for transport to the lungs, where it is expired. In this form, it is known as carboxyhaemoglobin and it is a purply-red colour.

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Q: What color changes does hemoglobin go through during loading and unloading of oxygen?
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