Nov 20, 1940

THE UPTAKE OF INORGANIC ELECTROLYTES BY THE CRAYFISH

The Journal of General Physiology
N S Maluf

Abstract

1. Reasons are given for believing that the uptake of Na(+), Cl(-), and NaCl by the crayfish occurs through the gills. 2. A crayfish in fresh water, with a Cl concentration of about 0.2 mEq./l., can) by active Cl absorption, compensate entirely for Cl lost in the urine. 3. The carbonic anhydrase activity of the gills is markedly higher than that of other tissues of the crayfish, but the equivalent CO(2) output of the crayfish is far in excess of the equivalent Cl absorption per unit time and weight and thus fails to warrant the supposition that Cl absorption is of respiratory importance. 4. The carbonic anhydrase activity of the soft integument of the lobster, before and after molting, and of the hypodermis of the hard-cuticled animal is almost identical and of the same order as that of other tissues of the lobster. 5. The concentration of the electrolytes was about 7.5 mEq./l.; i.e., considerably lower than in the blood of the crayfish. Cl(-) can be taken up independently of the complementary cation. Na(+) can be taken up independently of the complementary anion. K(+) and SO(4) (=) are not taken up at all. In pure NaCl, the Na(+) and Cl(-) are absorbed evidently largely together. Ca(++) is absorbed only in newly molted animals...Continue Reading

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Mentioned in this Paper

Integumentary System
Molting
Urine
Electrolytes
SLC25A29 gene
Carbonate Dehydratase Activity
Uptake
Electrolytes Measurement, Serum
Cations
Subcutaneous Tissue

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