Abstract

1. The Q02 of excised Cardisoma guanhumi gill tissue is higher in hypo-osmotic than in hyperosmotic sea water. 2. Gill tissue Q02 is maximally stimulated by Na+; K+ does not stimulate Q02 addition of Na+ and K+ simultaneously causes no greater stimulation of oxygen uptake than that following Na+ alone. 3. Ouabain, a Na+ transport inhibitor, reduces Na+-, and Na+ + K+stimulated gill tissue respiration. In addition, Q02 of gill tissue measured in 75% sea water is reduced by ouabain.

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