<prompt> A primigravida with 38 completed weeks of gestation has gone into labor. Oxytoxin was staed to augment labor. The second messenger system through which oxytoxin acts is ?cAMPPhospholipasecGMPTyrosine kinase  <response>: The second messenger system through which oxytoxin acts in phospoholipase C mechanism. Hormones acting IP3- DAGor phospholipase C pathway: Acetylcholine muscuranic Angiotensin II ADH V1 receptor a1 receptor adrenergic hormones Cholecystokinin Gastrin GnRH Oxytoxin TRH GHRH Substance P Ref: internet sources 