Subject
*Labor; Absorption/drug effects; Amiloride/administration & dosage; Animals; Enzyme Activation/drug effects; Enzyme Inhibitors/administration & dosage; Epinephrine/metabolism; Extravascular Lung Water/*metabolism; Female; Fetal Organ Maturity/drug effects; Fetus/metabolism; Guinea Pigs; Hydrocortisone/metabolism; Induced; Interleukin-1/*administration & dosage/metabolism; Ion Transport/drug effects; Lung/*embryology; Maternal-Fetal Exchange/drug effects; Metyrapone/administration & dosage; Oxytocics/*administration & dosage; Oxytocin/*administration & dosage; Pregnancy; Propranolol/administration & dosage; Sodium Channel Blockers/administration & dosage; Sodium-Potassium-Chloride Symporters/metabolism; Vasodilator Agents/administration & dosage