Prostaglandins, myometrial 'enhancement' and calcium.
D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D004357:Drug Synergism; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D009130:Muscle, Smooth / Q000187:drug effects; D011453:Prostaglandins / Q000494:pharmacology*; D014599:Uterus / Q000187:drug effects*; D014667:Vasopressins / Q000494:pharmacology
D011453:Prostaglandins; D014667:Vasopressins; D000109:Acetylcholine; D002118:Calcium