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The endocrine system is a control system of ductless glands that secrete hormones that circulate within the body via the bloodstream to affect cells within specific organs. It is also instrumental in regulating mood, growth and development, tissue function, and metabolism, as well as sending messages and acting on them. Typical endocrine glands are pituitary, thyroid, and adrenal glands, but not exocrine glands such as salivary glands, sweat glands and glands within the gastrointestinal tract.