what is the major organ of the endocrine
The endocrine system is made up of the pituitary gland, thyroid gland, parathyroid glands, adrenal glands, pancreas, ovaries (in females) and testicles (in males), the Mayo Clinic notes. The word endocrine derives from the Greek words endo, meaning within, and crinis, meaning to secrete, according to Health Mentor Online.