Various types of endocrine cells are located in different glands throughout the body. Each type of endocrine cell secretes specific hormones, which have distinct functions. Some examples include: The pancreas' beta cells create insulin and control blood sugar levels. Thyroid follicular cells secrete thyroxine, which is involved in metabolism regulation. Adrenal glands produce cortisol, which regulates stress response and metabolism. Gonad cells in the testes and ovaries produce sex hormones, which control reproductive processes.