The Structure and Function of Muscle. Volume II: Structure, by Geoffrey Bourne (Eds.)

By Geoffrey Bourne (Eds.)

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Extra resources for The Structure and Function of Muscle. Volume II: Structure, Part 2

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A) Diagram of the microelectrode, technique. (B) Original tracings of the resting and action potentials. Note the recorded potential difference across the membrane when the microelectrode penetrates the myometrial cell (Goto and Csapo, 1959). Note also the action potential when electrically induced depolarization reaches the threshold value. ) measurements of the extracellular space (values of 30-40% are commonly quoted). However, it was observed (Fig. 5) that the resting potential is lowered by a stepwise increase in the [K] 0 , although a less than 58 mV slope was recorded for a tenfold change in [K] 0 .

7) explain how the working capacity of the uterus is promoted by increasing uterine volume. These effects of stretch on contractility are complemented by additional actions on ex­ citability. The microelectrodes revealed (Fig. 22) (Kuriyama and Csapo, 1961) that stretch lowers the membrane potential and threshold, in­ creases the frequency and total number of spikes in the train, increases the repetition frequency of the subsequent train discharges, and increases conduction velocity. No stimulants are known which have more pro­ found effects on uterine function.

The effects of ovariectomy and estrogen substitution therapy on the delivery mechanism. Pregnant rats. Note the precise timing of normal delivery, the failure in delivery after ovariectomy, and the correction of this failure by estrogen substitution therapy. ) amined in the excised uterus) explained this failure in delivery. Mechani­ cal activity decreased and electrical stimulation of limited uterine regions did not induce activity at distant portions. However, this short-term (48 hrs) estrogen deficiency did not reduce the contractile capacity of the uterus (probably because the uterine volume was sustained by the undelivered litter).

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