How do respiratory pigments act?

How do respiratory pigments act?
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Respiratory pigments are oxygen-carrying molecules present in the blood. When the oxygen concentration is high, for example, in the pulmonary alveoli, the respiratory pigments bind to the gas. In conditions of low oxygen concentration, e.g., in tissues, the respiratory pigments release the molecule. In the human blood the respiratory pigment is hemoglobin, present within the red blood cells.
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