Abstract
Summary and conclusions
Ouabain causes increased oxygen consumption of embryonic chick hearts in Locke solution and in Locke solutions whose potassium or calcium contents had been radically decreased or increased. The effects of ouabain on the beat are exaggerated in potassium-deficient and calcium-excess solutions and reduced in potassium-excess solutions. Increased oxygen consumption produced by ouabain is not dependent on changes in beat of the heart.
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