respiratory pigment


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respiratory pigment

n.
Any of various colored conjugated proteins, such as hemoglobin, that occur in living organisms and function in oxygen transfer in cellular respiration.

respiratory pigment

Any pigment such as hemoglobin, myoglobin, or cytochrome that has a part in the metabolism of oxygen within the body.
See also: pigment

respiratory pigment

a substance present in blood, usually in the corpuscles or the plasma, that combines reversibly with oxygen and acts as a store for it. Oxygen is taken up in a respiratory organ such as the lung, and blood gives up oxygen where it comes into contact with oxygen-deficient tissues. Examples of such pigments include HAEMOGLOBIN, HAEMOCYANIN, CHLOROCRUORIN, HAEMERYTHRIN. See also OXYGEN DISSOCIATION CURVE.