ELECTRICAL AND MECHANICAL PROPERTIES OF LONGITUDINAL AND CIRCULAR MUSCLES OF THE GUINEA-PIG ILEUM

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  • SUZUKI Hikaru
    Department of Physiology, Faculty of Dentistry, Kyushu University
  • KURIYAMA Hirosi
    Department of Physiology, Faculty of Dentistry, Kyushu University

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  • Electrical and mechanical properties of

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The membrane potential of the electrically quiescent circular muscle fibre is higher than that of the spontaneously active longitudinal muscle fibre. The length constant of circular muscle fibres is longer than that of the longitudinal muscle. The electrical activity of the longitudinal muscle membrane is enhanced by caffeine and PGE1 is suppressed for the circular muscle. Isotonic K Krebs solution generates a large tonic response of the contracture of longitudinal muscle tissue, but in circular muscle it is small. Following an inward current pulse, a large rebound contraction of the circular muscle was generated during K-induced contracture but it was small in the longitudinal muscle tissue. Caffeine suppressed the K-induced contracture of both tissues but enhanced the rebound contraction of the circular muscle. Verapamil and lanthanum suppressed the mechanical responses of both muscle tissues but rebound contraction evoked in isotonic K Krebs solution was of longer duration in circular muscle tissue than in longitudinal muscle tissues. It is postulated that both muscle tissues possess different electrical and mechanical properties, and that these differences are not caused by nervous activity.

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