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Carbon dioxide excretion in the land crab (Cardisoma carnifex)

✍ Scribed by Randall, D. J. ;Wood, Chris M.

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
496 KB
Volume
218
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The hemolymph of Cardisoma carnifex shows a small Haldane effect and some CO~2~ is probably bound to blood proteins. Carbonic anhydrase activity is located in the gill epithelium but is absent from the blood. Inhibition of carbonic anhydrase activity in vivo by injection of 50 mg/kg Diamox into the infrabranchial sinus causes a prolonged increase in blood P and the P gradient across the gills. Both M and M, however, are maintained at normal rates during rest and severe exercise. The gill diffusing capacity for CO~2~ is reduced by Diamox treatment, and it is concluded that the catalysed bicarbonate dehydration reaction within the gill epithelium contributes to the pool of excreted CO~2~. During exercise the CO~2~ content of the blood is decreased, and bicarbonate is probably mobilized from other sources in the body. It is possible that Diamox interferes with this process.

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