* Metyrapone, a drug used in the diagnosis of adrenal insufficiency
* Triple bolus test
* Renin, enzyme that converts angiotensinogen 1 to angiotensin 2, a precursor to aldosterone
* Renin-angiotensin-aldosterone system
* HPA axis, explains the connections of the hypothalamus, pituitary and adrenal glands
* Hypopituitarism