Figure 10. Effect of membrane depolarisation and L-type Ca2+ channel blockade on carbachol-induced contractions.
A, effect of depolarisation on maximal (20 μm) carbachol-elicited isometric contractions of a detrusor muscle strip; superfusate KCl was raised to from 4 to 16 mm between the second and third contractions. B, effect of an L-type Ca2+ channel antagonist; 10 μm nifedipine was added between the second and third contractions.