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Fig. 5. Temperature dependence of the muscle fiber resting potential in the
presence and absence of serotonin (5-HT). Symbols represent the change in
resting potential with respect to the value measured at 2°C measured in
the same eight muscle fibers as a function of temperature in the absence
(solid symbols) and presence (open symbols) of 5-HT. Data are normalized in
both cases to the values of the resting membrane potential recorded at
2°C. Addition of 5-HT (100 nmol l–1) at 2°C produced
a mean change in resting membrane potential of +4.75 mV; the data measured in
the presence of 5-HT is offset accordingly. Arrows indicate the temperatures
at which IJPs reverse polarity (Trev) under control
conditions (6.6°C) and in the presence of 5-HT (13.2°C). At each
temperature N=8 except as follows: for 10°C N=6, for
12°C N=4, for 14°C N=2.
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