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exocrine glands | use ducts to carry their chemical messengers: include sweat glands and the bite ducts. |
endocrine glands | are "ductless" and secrete hormones directly into the bloodstream to be carried to a target organ; most hormones are endocrine in nature. |
neuro hormones | a neurotransmitter that is secreted directly into the bloodstream type from neurons; affect the transmission of stimulus within the nervous |