BIOL-K - Biology BIOL-K 103 Lecture Notes - Lecture 10: Simple Squamous Epithelium, Loose Connective Tissue, Kkcw
27 Apr 2016
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Switch skeletons into exam one and surface coverings into two. Epithelial tissue characteristics: cells tightly packed, continuous sheet, surfaces exposed to environment, attached to basement membrane forms foundation, barrier everything must cross it, regulates exchange between body and environment. Cellular contacts tight junctions, desmosomes, gap junctions. Polarity have a charged difference across cell membrane: avascular but innervated. Squamous epithelial cells thin, flat cells, single layer: function: rapid diffusion, absorption, filtration, secretion, location: alveoli, lines lymphatic and blood vessels. Cuboidal short, eight-sided cylinders, boxed, one cell layer: function: secretion and absorption, location: kidney: tubules, ovary: surface, small glands: ducts (pancreas) Stratified two or more layers of cells: function protection, location: areas of abrasion, wear and tear, two types, keratinized dry surface skin, nonkeratinized moist surface (mouth, esophagus, vagina) Stratified cuboidal cells: function: secretion, location: ducts of larger glands (salivary, sweat, mammary) Stratified columnar epithelium: function: protection and secretion, location: mammary glands, male urethra, larynx.
