Abstract
Intracellular recordings were made from neurones of the myenteric plexus of the guinea-pig ileum. The slow after-hyperpolarization which followed an action potential in some neurones was abolished by Mn++, La+++ and by solutions which contained no Ca++. In these neurones, the action potential and the slow after-hyperpolarization persisted in Na+-free solutions or in the presence of tetrodotoxin (2 μM). The findings suggest that an inward Ca++ current during the action potential is essential for the slow after-hyperpolarization.
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Selected References
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