By Geoffrey Bourne (Eds.)
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Additional resources for The Structure and Function of Muscle. Volume II: Structure, Part 2
Resting and action potentials were recorded from myometrial cells of 5-10 μ in diameter. 5 μ in diameter), several attempts failed before a steady and sustained deflection revealed the true value of the resting potential (Fig. 13) (Goto and Csapo, 1959; Goto et al, 1959). Depend ing on regulatory conditions, (inside negative) potential differences of 35-60 mV have been recorded between the interior and the exterior of the myometrical cells. In a variety of excitable tissues, the magnitude of the resting potential was related to the concentration gradients of potassium and sodium across the cell membrane.
In those animals which during pregnancy are largely under the systemic (luteal) effect of progesterone, the evolution of IUP and OR only manifests when the progesterone effect is largely withdrawn shortly before delivery (Fig. 31) (Csapo, 1969a). In contrast, in those species in which the uterus is controlled by a local (placental) progesterone effect, the evolution of IUP and OR are apparent earlier in pregnancy, because the block weakens grad ually as the nonplacental region increases (Fig. 31).
The mechanism of action has not been fully resolved, as yet, for any hormone and progesterone is no exception. Investigators recorded a higher membrane potential in myometrial cells when the uterus has been exposed to progesterone and the possibility has been considered that this increase in membrane potential is one underlying reason of reduced excitability and conduction. However, hyperpolarization pro vides no adequate explanation, for when it is accomplished by lowering the [K]o, the uterus does not acquire the properties of the progesteroneblocked organ.
The Structure and Function of Muscle. Volume II: Structure, Part 2 by Geoffrey Bourne (Eds.)