Abstract
A NUMBER of invertebrate animals possess blood pigments which are generally assumed to be respiratory, although only in a few instances has a respiratory function been demonstrated experimentally. One or more of three functions are imputed to these pigments: (a) they may act like haemoglobin in ourselves, as a transporter of oxygen at all times; (b) they may come into action as oxygen transporters only when oxygen is deficient in the outside world, there normally being enough of the gas in simple solution in the blood for the restricted wants of the relatively sluggish animal; (c) they may serve as a reservoir of oxygen to be drawn upon during temporary shortage of the gas in the environment.
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FOX, H. Function of Chlorocruorin in Sabella and of Haemoglobin in Lumbricus. Nature 145, 781–782 (1940). https://doi.org/10.1038/145781b0
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DOI: https://doi.org/10.1038/145781b0
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