Abstract
Gap junctions were found in rat myometrium only during parturition of abortion. A comparison was made between the values of the length constants obtained from longitudinally cut strips of rat myometrium at the midterm stage of pregnancy and during parturition. No significant difference was found between these values. No significant difference was found between length constants measured in myometrium from rats near term (22 days) and those during parturition, or between midterm myometrium and myometrium taken from animals aborting at midterm following ovariectomy. It was concluded that the appearance of gap junctions in parturient myometrium does not alter the spread of passive current in the longitudinal axis of the cells in these tissues. It is suggested that gap junctions are not required for spread of passive current, and that other structures may provide an alternate path.
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