BIOB32H3 Lecture Notes - Apocrine, Neuroglia, Adipose Tissue
28 Mar 2013
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Document Summary
Tissues and tissue types: tissues are, collections of specialized cells and cell products organized to perform a limited number of functions, histology = study of tissues, the four tissue types are, epithelial, connective, muscular, nervous. Epithelial tissue: includes glands and epithelium, glands are secretory, is avascular, forms a protective barrier that regulates permeability, cells may show polarity. Functions of epithelium: physical protection, control permeability, provide sensation, produce specialized secretions. Specializations of epithelium: perform secretory functions, perform transport functions, maintain physical integrity, ciliated epithelia move materials across their surface. Maintaining the integrity of epithelium: cells attach via cell adhesion molecules (cam, cells attach at specialized cell junctions, tight junctions, desmosomes, gap junctions. Structure of typical epithelium: basal lamina attaches to underlying surface, lamina lucida, lamina densa, germinative cells replace short-lived epithelial cells. Classification of epithelia: number of cell layers, simple, stratified, shape of apical surface cells, squamous, cuboidal, columnar.
