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Gland- consists of one or more cells that make and secrete a particular product called a secretion, an aqueous fluid usually containing proteins.
-Endocrine glands produce hormones which enter the blood or lymphatic fluid and travel to specific target organs. Most glands are compact multicellular organs, but some are scattered in the digestive tract and the brain.
-Exocrine Glands are more numerous, and many products are familiar, they secrete their products onto body surfaces or into body cavities. Include mucous, sweat, oil, and salivary glands, the liver, pancreas, and others.
- Unicellular Exocrine Glands: only example is a goblet cell- sprinkled in the linings of intestinal and respiratory tracts, producing mucin, complex glycoprotein that dissolves in water, forming mucus.
-Multicellular Exocrine Glands: structurally more complex, have two basic parts: an epithelium derived duct and a secretory unit. Either simple, which have an unbranched duct, or compound, which have a branched duct.
Glands: