Electrical correlate of circumferential contractions in human colonic circular muscle.

The role of myogenic electrical activity in the coordination of circumferential contraction of the human colon circular muscle was investigated. Five suction electrodes were placed (5-7 mm apart) on isolated rings of human colon and simultaneously electrical and motor activities were measured. In normal Krebs solution, the slow waves were not synchronised in most preparations studied. The electrical activities at the different recording sites …