Fig. 4
pHi changes during the stimulation by 10 μM carbachol (CCh) in rat parotid ducts. a Time courses of pHi changes induced by CCh addition. pHi dispersion in the resting state became smaller after the addition of CCh. pHi traces for 30 ducts are shown. b Relationships between the CCh-induced pHi changes (ΔpH) and the resting pHi levels. Each point was obtained from the data in (a) (n = 30)