Kanno T, Matsuda K. The effects of external sodium and potassium concentration on the membrane potential of atrioventricular fibers of the toad.
J Gen Physiol 1966;
50:243-53. [PMID:
11526826 PMCID:
PMC2225646 DOI:
10.1085/jgp.50.2.243]
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Abstract
Intracellular records were made from fibers in the A-V conducting system of isolated toad hearts. The A-V region was perfused with Ringer's solution of various K and Na concentrations. Resting potential in 2.8 mM [K]o was about 60 mv. Over the range 0.28 to 28 mM, resting potential diminished with increasing [K]o. Spontaneous action potentials appeared when [K]o was increased to 11.2 mM, and when resting potential had fallen to about 40 to 50 mv. Changes in [Na]o over the range 22 to 110 mM had a little effect on resting potential, but there was a linear relation between the peak value of the action potential and log [Na]o. Wenckebach periodicity was observed when [Na]o was lowered.
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