knobil and neill s physiology of reproduction r steroids. Polycystic Ovary Syndrome (PCOS): Dysregulation of GnRH pulsatility and gonadotropin secretion. Hypogonadism: Conditions of deficient gonadal hormone production. Menopause and Andropause: Decline in ovarian or tes D Dr. Lorena Wolff Sep 10, 2025