Regular contractions over a period of two hours.

Near-consecutive DMaps of a small intestine (start times indicated at left) over a period of almost two hours. Note that at 10:46 (the start of the first map) the intestine had already been over 40 minutes in the organ bath and 1.5 hours had elapsed since it was removed from the mouse. The tone of the intestine decreases a little, but regular slow-wave driven contractions continue unabated. [CD-1 mouse; 0.5 mM lidocaine; luminal perfusion].