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1. The action potential duration of anoxic guinea-pig ventricular muscle was related to ATP generated by glycolysis. In 50 mM glucose medium the action potential duration was maintained; in 5 mM glucose medium the action potential duration shortened, the glycolytic rate declined and the ATP content was reduced.

2. The action potential amplitude was related to the metabolic state of the muscle but not to the intracellular sodium concentration.

3. It is suggested that changes in the action potential duration and overshoot in anoxic muscle may be due to an influence of metabolism on the slow inward current.

4. Anoxic muscle incubated for 8 hr in 5 mM glucose medium had an E_m of -77·1 mV compared to -81·1 mV in fresh muscle. The calculated E_k of anoxic muscle was -47·4 mV.

5. The resting potential of anoxic muscle was separated into two components, one dependent on potassium distribution and the other on the activity of an electrogenic sodium pump.

6. The electrogenic pump component was stimulated upon raising the glucose concentration of the medium or upon raising the external potassium concentration.

7. The electrogenic pump component was inhibited by ouabain or by reduction of the temperature from 35 to 8° C.