Letter | Published:

Activation of a voltage-insensitive conductance by inward calcium current



ELECTRICAL excitability is more complex in cell bodies than in axons. In various nerve cells there is a voltage-sensitive permeability to calcium as well as to sodium and potassium. Furthermore, increased calcium in the cytoplasm of nerve cell bodies increases their potassium permeability. In voltage-clamped Helix neurones, Meech and Standen1,2 reported that a substantial fraction of the potassium conductance activated during a depolarisation depends on an inward calcium current.

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    Meech, R. W., and Standen, N. B., J. Physiol., Lond., 237, 43–44 (1974).

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    Meech, R. W., and Standen, N. B., J. Physiol., Lond. (in the press).

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