CorticosteroneHypothalamo-Hypophyseal SystemAdrenocorticotropic HormoneAdrenalectomyPituitary-Adrenal SystemRestraint, PhysicalAdrenal GlandsStress, PhysiologicalMetyraponeCorticotropin-Releasing HormoneReceptors, GlucocorticoidMifepristoneStress, PsychologicalTranscortinReceptors, MineralocorticoidRats, Sprague-Dawley