Fig. 2.
Stability of the intraterminal Δ[Ca2+]i in response to a given stimulation. A, Superimposed are five traces recorded from a unit in response to 200 stimuli delivered at 20 Hz in different bathing solutions. Ryanodine (RY) was added to the bathing solution in increasing concentrations. The 10 μmryanodine trace was recorded more than 3 hr after the trace in normal Ringer solution (NR) was taken. B, Superimposed are five traces recorded from another unit in response to 300 stimuli delivered at 20 Hz. The first four responses were recorded in normal Ringer solution over a period of 88 min. The response in ryanodine was recorded last.