KINESIOL 2Y03 Lecture Notes - Lecture 4: Central Nervous System, Pia Mater, Endothelium
3 Oct 2016
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Document Summary
Surrounded by large amounts of extracellular matrix: muscular, nervous. Epithelial covers and protects surfaces, both outside and inside the body. Pseudostratified: appears to have multiple layers but actually doesn"t all cells attach to basement membrane. A gland is a single cell or mass of epithelial cells adapted for secretion. Endocrine glands have no open cell surface and no ducts. Exocrine glands have open cell surface and have ducts. Multicellular glands: composed of many cells that form a distinctive microscoptic structure or macroscopic organ. Merocrine: in merocrine secretion, products are released, but no actual cellular material is lost. Secretions are either actively transported or packaged in vesicles and then released by the process of exocytosis at the free surface of the cell. Merocrine secretion is used by water-producing sweat glands and the exocrine portion of the pancreas. Apocrine: the secretory products are released as fragments of the gland cells.
