Abstract
PREVIOUS work1 has shown that the sodium efflux from squid giant axons is sensitive to the external concentration of potassium ions; the Na efflux falls to about 1/3 of control values when the sea water surrounding the axon is made free from potassium. Similar observations have been made with frog sartorius muscle2, but these showed further that when [Na]i in muscle was low, Na efflux was no longer sensitive to external [K]. The following experiments were undertaken to see if the Na efflux from squid axons would be similarly insensitive to [K0] if [Na]i were low.
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References
Hodgkin, A. L., and Keynes, R. D., J. Physiol., 128, 28 (1955).
Keynes, R. D., and Swan, R. C., J. Physiol., 147, 591 (1959).
Mullins, L. J., Adelman, W. J., and Sjodin, R. A., Biophys. J., 2, 257 (1962).
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FRUMENTO, A., MULLINS, L. Potassium-free Effect in Squid Axons. Nature 204, 1312–1313 (1964). https://doi.org/10.1038/2041312b0
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DOI: https://doi.org/10.1038/2041312b0
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