Q. An 18-year-old woman is referred to an OBG due to amenorrhea. She reports occasional bouts of nausea, vomiting, and generalized weakness. The patient mentions having a lot of acne and is wondering if she should see a dermatologist. Her blood pressure is 160/99 mm Hg. Labs show a serum K+ level of 2.2 mEq/L. Labs combined with amenorrhea indicate this patient suffers from a condition affecting the production of two of the three adrenal hormones. In which area of the adrenal gland is the one remaining hormone produced?