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Glands
A gland consists of one or more cells that make and secrete a particular product. They create a secretion. A secretion is an aqueous fluid that usually contains proteins. It is an active process.it can be both the gland's product and the process of making and releasing a product. Endocrine glands eventually lose their ducts, tubelike connections to the epithelial sheets, and are called ductless glands. They produce hormones, regulatory chemicals that they secrete by exocytosis directly into the extra cellular space. Endocrine glands are usually compact multicellular organs. Exocrine Glands are more numerous than endocrine glands. They secrete their products onto body surfaces or into body cavities. Unicellular exocrine glands are sprinkled in the epithelial linings of the intestinal and respiratory tracts. They are called goblets. In glands mucin forms mucus. Multicellular exocrine glands are an epithelium-derived duct and a secretory unit. Supportive connective tissue surrounds the secretory unit and supplies it with blood vessels and nerve fibers. Multicellular glands are either simple or compound. Simple glands have am unbranched duct. Commune glands have. Branched duct.
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