Respiratory pigment

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A respiratory pigment is an agent that will increase the oxygen-carrying capacity of the blood, such as the hemoglobin (red in colour) in humans. The four most common invertebrate respiratory pigments are haemoglobin, haemocyanin, haemerythrin and chlorocruorin. Haemoglobin is red when oxygenated, and blue when deoxygenated, oxygenated haemocyanin is blue in color, deoxygenated is almost colorless. Oxygenated Chlorocruarin turns green where oxygenated haemeryhrtin is a violet to pink colour, and colorless when deoxygenated. All vertebrates use the haemoglobin respiratory pigment.

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