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Am J Physiol Regul Integr Comp Physiol 235: R35-R40, 1978;
0363-6119/78 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 235, Issue 1 35-R40, Copyright © 1978 by American Physiological Society

ARTICLES

Sodium transport in the freshwater mussel, Carunculina texasensis (Lea)

T. H. Dietz

Freshwater bivalves maintain a Na steady state in artificial pondwater: JiNa = 1.2 +/- 0.1 mumol/g dry tissue per h. Na uptake is Cl independent. The affinity (KS) of the Na transport system is 0.15-0.23 mmol Na/1. Sodium influx is coupled to H and/or NH4 exchange. Salt depletion stimulates JiNa 300% relative to nondepleted animals with no change in Ks. Injected ammonium ion stimulates JiNa. Sodium transport is inhibited 84% by 0.5 mM amiloride but is not affected by 4 mM NH4 or 1 mM furosemide in the bathing solution or injection of acetazolamide (0.26 mumol/ml blood).




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