Fig. 6. Membrane potential responses of the cardiac ganglion (CG) neuron to stretches. (A,B) Superimposed traces of intracellular recording from Cell-6 (upper traces) in the normal saline solution (i) and in the presence of 1.0 µmol l^-1 tetrodotoxin (TTX) (ii). Stretches were applied to the anterior half of the heart and are shown by the amount of displacement of the unfixed stage (lower traces). The records shown here were obtained from a single preparation. In B, the hyperpolarizing responses were shown at higher gain. Note that the stretch-induced hyperpolarization gradually decreased in amplitude during the stretch in the normal saline (Bi) whereas it stayed relatively constant in TTX (Bii). (C) Membrane potential of the CG neuron during the stretch versus amplitude of the stretch. Data were obtained repeatedly from a single preparation in the normal saline solution (open circle) and in TTX (filled circle). (D) Time latency for the rebound burst discharge after termination of stretch versus amplitude of the stretch. Stretches of various amplitudes were applied with durations of 1.5 s (triangle), 1.0 s (square) and 0.5 s (circle). Data were obtained repeatedly from a single preparation.