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Fig. 5. Membrane currents of L- and T-responses of nematocytes. (Aa, Ba) Two
L-responses of the same nematocyte (voltage-clamped near the resting
potential) induced by deflections of the same cnidocil apparatus of a distant
nematocyte with a time interval of 0.6 s. The L-response in B was associated
with cyst discharge of the stimulated cell. T-events occurred superimposed on
the L-responses. Lower traces: probe excursions (the small second excursions
did not reach the cnidocil). (Ab, Bb) Higher time resolution of the initial
phases of the responses. Note the earlier and steeper start of the L-response
in B. (C) Membrane currents of T-events recorded when the membrane voltage was
clamped at –70 mV. (D) T-currents at various clamped membrane voltages;
voltages indicated next to the traces. Arrowheads indicate steps of outward
current at reversed membrane voltages. Note sign reversal of the current at
clamped –10 mV. (E) Amplitudes of T-currents as a function of clamped
membrane voltage. Filled circles indicate the second outward current component
of two-phase events. The straight line indicates a linear fit to the data. All
records from Stauridiosarsia.
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