What are respiratory pigments? What is the respiratory pigment present in some arthropods? Which is the analogous molecule in humans?

What are respiratory pigments? What is the respiratory pigment present in some arthropods? Which is the analogous molecule in humans?
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Respiratory pigments are molecules able to carry oxygen and other respiratory gases present in circulatory fluids. In crustaceans and in arachnids hemocyanin is the respiratory pigment. In humans the analogous pigment is hemoglobin.
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