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Any of various colored conjugated proteins, such as hemoglobin, that occur in living organisms and function in oxygen transfer in cellular respiration.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Any pigment such as hemoglobin, myoglobin, or cytochrome that has a part in the metabolism of oxygen within the body.
See also: pigment
Medical Dictionary, © 2009 Farlex and Partners
respiratory pigmenta 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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005