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Although it is no bigger than a pea, the pituitary gland, located at the base of the brain just beneath the hypothalamus, is considered the most important part of the endocrine system. It's often called the master gland because it makes hormones that control several other endocrine glands.
Parts of the Endocrine System. Hormones. Hormones are chemicals that control specific biological functions. They are made in your endocrine glands, secreted in small amounts directly into your bloodstream, and travel to other organs where they induce an action in the organâs cells. The Major Glands of the Endocrine System. Hypothalamus.