title: Factors influencing circular muscle activity in the pregnant rat uterus.
mesh_terms: D000818:Animals; D001835:Body Weight; D002369:Castration; D005260:Female; D005333:Fetus / Q000502:physiology; D007743:Labor, Obstetric; D009215:Myometrium / Q000502:physiology; D010920:Placenta / Q000502:physiology; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats; D014590:Uterine Contraction; D014599:Uterus / Q000502:physiology*