KINS 1223 Study Guide - Comprehensive Final Guide: Subset, Collagen, Glycolysis
29 Nov 2016
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Unique fuzzy cell structure: carbohydrate portions of membrane glycoproteins and glycolipids, unique in everyone but identical twins. Functions: cell recognition, adhesion and protection. Sticky surface helps bind adjacent cells together. Aids in cellular uptake from extracellular fluid. Id of bacteria and viruses by immune systems cells. Increase surface area for absorption: brush boarder. Intercellular junctions: adjacent cells are bound by lateral contacts, all cells (except blood) anchored to each other or their matrix by intercellular junctions, reduce or eliminate extracellular space. Tight junctions: proteins molecules in adjacent plasma membranes fuse together, forms impermeable junctions (zippers, percent passage between. Desmosomes: proteins filaments hold adjacent cells together, plasma membranes do not touch, prevent separations of tissue layers, resist tension force, example : uterus, heart and epidermis. Gap junctions: connect cells by hollow cylinder composed of transmembrane proteins called connexons, allows small molecules and electrical excitation pass through connexons, example: cardiac and smooth muscle. Organelles: specialized tasks, have a membrane.
