Abstract
The transport of respiratory gases to and from gas exchange sites is clearly the central function of the blood in squid. In view of the squid’s inability to live without oxygen for even a brief period (Dykens and Mangum, 1978), one would expect the squid gas transport system to be highly adapted to maintain an adequate supply. The cephalopod oxygen transport system has been characterized as a rather poor one, primarily on the grounds that the blood oxygen carrying capacity, in this case a simple function of concentration of the carrier molecule hemocyanin (Hc), is lower than in most fishes (e.g., O’Dor and Webber, 1986). This view (often overtly tongue-in-cheek) is a welcome departure from the attitude that a physiological system, regardless of its properties, must be the best of all possible ones under the particular set of circumstances. But it also ignores the considerable genetic constraints placed upon the evolution of one taxon from another. The Order Teuthoidea evolved from more primitive cephalopods that almost certainly already transported oxygen bound to a molecule that resembles present day teuthoid Hc. Moreover, the Class Cephalopoda did not evolve from the same kinds of animals that gave rise to the fishes, which may well have transmitted the genetic information for only hemoglobins. It is likely that cephalopods evolved from animals that relied on a distinctive molluscan type of Hc for their metabolic oxygen supply (Mangum et al.,1987). He is not carried inside a blood cell but is dissolved in the blood. Hc is a copper containing respiratory pigment and the copper gives the oxygenated form (oxyHc)(HcO2) a blue color. The deoxygenated form (deoxyHc) is colorless.
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Mangum, C.P. (1990). Gas Transport in the Blood. In: Gilbert, D.L., Adelman, W.J., Arnold, J.M. (eds) Squid as Experimental Animals. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2489-6_20
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