A 25-year-old primigravid woman at 42 weeks' gestation is admitted to the hospital for failure to begin spontaneous labo

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A 25-year-old primigravid woman at 42 weeks' gestation is admitted to the hospital for failure to begin spontaneous labor. She has no history of major medical illness. Pregnancy has been uncomplicated Her vital signs are within nonnal limits. Physical examination shows a uterus consistent with a 42-week gestation. Intravenous infusion with oxytocin is initiated. Activation of which of the following signaling pathways most likely mediates the therapeutic effect of this drug for this patient?


A. cAMP synthesis
B. cGMP synthesis
C. Gene transcription
D. Phosphoinositide hydrolysis
E. Tyrosine phosphorylation