Anatomical system that consists of the glands and parts of glands that produce exocrine secretions and help to integrate and control bodily metabolic activity. Exocrine glands are glands that secrete their products (hormones) into ducts (duct glands). They are the counterparts to endocrine glands, which secrete their products (hormones) directly into the bloodstream (ductless glands) or release hormones (paracrines) that affect only target cells nearby the release site. [Wikipedia].