ELECTROPHYSIOLOGICAL STUDY OF THE INTESTINAL SMOOTH MUSCLE OF THE GUINEA-PIG.
KYUSHU UNIV FUKUOKA (JAPAN) DEPT OF PHYSIOLOGY
Pagination or Media Count:
Below 60 mV of membrane potential, overshoot potential and 11-18 Vsec of the maximum rate of rise of the spike were measured from various parts of longitudinal and circular muscles of the intestine. Conduction velocities of the longitudinal muscles of jejunum and rectum under tetrodotoxin were 2.1 and 4.0 cmsec respectively and chronaxies of them were 2-5 and 5-18 msec respectively. Effective membrane resistance of the above two tissues was the same and showed 40-50 M ohms and time constant was 3-5 msec. Time constants measured by extracellular polarization were differed by the tissues. Relation between the membrane properties and morphological arrangements of the tissues was discussed. Author
- Anatomy and Physiology