Endocrine System

The endocrine system is a complex network of glandular tissues that secrete hormones directly into the blood which are used by "target" organs. The endocrine system controls a variety of important functions such as energy metabolism, reproduction, and stress response. The pituitary gland is often referred to as the "master gland" because it regulates the hormones used by the thyroid, adrenal cortex, ovaries, testes, and the breasts (in women). The pituitary is located in the brain below the hypothalamus. It peaks in size in middle age and then gradually shrinks.