Abstract
1. 1. Pharmacological agents and specific ionic conditions modify membrane properties of Paramecia. 2. 2. Lanthanum, TEA and tetracaine increase input resistance and regenerative response amplitude indicating a blockage of the calcium leakage current normally occurring during regenerative depolarizations. 3. 3. TEA blocks late repolarizing current as in nerve and muscle. 4. 4. Lanthanum does not block activated early inward current as in metazoan calcium spike systems. 5. 5. Alteration of the external ( K)/( Ca) 1 2 ratio and increasing ionic strength at constant ( K)/( Ca) 1 2 yield results consistent with the hypothesis that ciliary reversal is determined by electrophysiological factors controlling internal calcium concentration.
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