BIOC21H3 Lecture Notes - Ziploc, Membrane Technology, Desmosome
11 Jan 2012
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Lecture 2 epithelium y epithelium is difficult to define because of various fcns y ec: because of this, have to be specialized, secetion off the surface of the epithelial cell, and are designed for that role. Ie: wont be good at protection: absorption taking things in, tansporting through tissue. Lining of gut specialized for that: transport across surface of epithelia. Trachea, moving of dust via mucus pushing it up: sensory , protection barrier, protective lining. Ex; skin, surface is e, and it is specialized for dealing with adverse conditions. Because thicker than most epithelia, can remove layers of skin without damaging those underneath: why are they special, arranged in sheets, continuous layers, linked together. Covers the surface of something: digestive tract cont with outside world, lined by epithelium, food comes from outside, and anything inside that tube, is from the ouside world. =>still a barrier between u and outside world.
