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Figure 1


Fig. 1. Currents recorded from a muscle fibre during prolonged hyperpolarising voltage commands. (A) Current electrode filled with 2 mol l–1 K-acetate. After the instantaneous jump, a small inward current develops within seconds. The superimposed traces, recorded 1 and 10 min after impaling the fibre, are nearly identical. Note that the lower trace represents the recorded voltage imposed by the pulse protocol. (B) Current–voltage relationships for the fibre in A. The instantaneous current (open symbols) is linear whereas the late current (filled symbols) exhibits slight inward rectification. (C) Recording from another fibre where current electrode filled with 3 mol l–1 KCl was used; voltage jump as in A. Although the current recorded is initially similar to that in A, the slow inward component is clearly increased 10 min after impalement. (D) I–V plot for the fibre recorded in C. The instantaneous current is practically linear, as in B, but the inward rectification of the late current is enhanced 10 min after impalement. Note inward-going tail currents after jumping from –110 to –60 mV. In both A and B the voltage electrode contained 3 mol l–1 KCl.





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