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Explain respiratory pigments

Explain the term respiratory pigments? What are various respiratory pigments and in which animal groups can all of them be found?

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Respiratory pigments are molecules existed in the blood which binds to oxygen transporting it to the tissues. In vertebrates, the respiratory pigment is hemoglobin, reddish due to the iron of its composition. In arachnid arthropods and crustacean and in some molluscs the respiratory pigment is hemocyanin, blue due to copper of its composition. Annelids contain hemoglobin, hemerythrin and chlorocruorin as respiratory pigments.

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