Abstract
Differences in action potential duration in different regions of the mammalian ventricle are not systematically present when quiescent tissue is first stimulated, but develop rapidly during repetitive activity. The effects of ouabain and temperature suggest the involvement of the Na+-K+ exchange pump.
MeSH terms
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Action Potentials* / drug effects
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Animals
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Biological Transport
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Cold Temperature
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Electrocardiography*
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Heart / physiology*
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Heart Ventricles / anatomy & histology
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Myocardial Contraction*
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Myocardium / metabolism
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Ouabain / pharmacology
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Potassium / metabolism
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Sheep
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Sodium / metabolism
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Time Factors