Intracellular studies of electrical membrane properties of opossum esophageal circular smooth muscle.

摘要: It has been suggested that regional differences in membrane properties of circular esophageal smooth muscle play an important role the mechanism peristalsis. The purpose this study was to examine both passive and active at proximal distal sites so as delineate myogenic intramural Intracellular recordings were made strips taken from (8 cm above gastroesophageal junction) (2 10 opossums using partition method Abe Tomita. At sites, determinations resting potentials, time constants, space thresholds for action potential amplitudes, rates rise durations half-amplitude. values these parameters respectively, follows: mean potential, 49.7 ± 0.24 49.5 0.3 mV; length constant, 4.0 0A 3.8 0.4 mm; 513 49 456 53 ms; threshold 9.3 8.8 amplitude 36.0 5.2 35.3 1.7 rate 2.3 2.6 + mVlms; duration potentials half-amplitude, 5.0 1.2 4.1 conduction velocity evoked 3.9 cm/s. Our studies show there are no between any determinations. These also electrical do not account