FIG. 5.
Carbachol activates muscarinic receptors in vitro. A: carbachol leads to a −4-mV depolarization of the membrane potential from a subthreshold level leading to spiking (spikes truncated at −35 mV). B: atropine eliminates the effects of carbachol, suggesting mAChR activation. C: ISI histogram showing an increase in ISI’s <10 ms after carbachol application. D: significant increase in the burst fraction (fraction of ISIs <10 ms) after carbachol application. E: carbachol also leads to an increased membrane resistance. F: carbachol in the presence of atropine does not increase the membrane resistance.