The endocrine system is a network of glands that secrete chemical messengers called hormones directly into the bloodstream to regulate distant target organs.
: Cortisol (adrenal glands) coordinates the "fight or flight" response. Endocrine Physiology
: Growth hormone (pituitary) and sex hormones drive physical development and puberty. The endocrine system is a network of glands
: The ultimate goal of these hormonal interactions is to maintain a constant, balanced internal environment regardless of external changes. Endocrine Physiology