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Fig. 1. The amplitudes of EJPs and IJPs vary as a function of temperature. (A)
Intracellular recordings from a muscle fiber in which a single EJP and a
single IJP are elicited in each stimulus trial over the temperature range
2–18°C. Traces are averaged from ten trials at each temperature; the
resting potential (RP) recorded at each temperature is indicated above each
trace. In this experiment, the IJP reversed polarity at 6.0°C. (B)
Amplitude of EJPs as a function of temperature in nine muscle fibers. Data are
normalized to the value measured at 2°C; at this temperature EJP amplitude
in these fibers ranged from 1.4 to 12.9 mV. EJPs are depolarizing in polarity
over the entire temperature range. (C) Amplitude of IJPs as a function of
temperature in six muscle fibers. Data are normalized to values measured at
2°C; at this temperature IJP amplitude in these fibers ranged from
–0.1 mV to –5.2 mV. The broken line indicates the reversal of the
IJP polarity; data below the broken line represent IJPs of hyperpolarizing
polarity. (D) Muscle resting potential (mean ± s.e.m.) measured as a
function of temperature in 18 muscle fibers, including those for which data is
presented in B and C. (E) Input resistance of muscle fibers (mean ±
s.e.m.; N=11) measured in response to hyperpolarizing current pulses.
Values are normalized to those measured at 2°C.
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