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The endocrine system is a control system of ductless endocrine glands that secrete chemical messengers called hormones that circulate within the body via the bloodstream to affect distant organs. It does not include exocrine glands such as salivary glands, sweat glands and glands within the gastrointestinal tract.
There are 3 subcategories in this category, which are shown below. More may be shown on subsequent pages.
There are 34 pages in this section of this category.