细胞的基本功能医学课件Cell(endoplasmicreticulum)一、细胞膜的分子结构(cellstructure)细胞膜或质膜(plasmamembrane)第一节细胞膜的物质转运功能Whyhaveacellmembrane?isolatethecellcytosol(intracellularfluid)fromextracellularfluidregulateexchangewiththeenvironmentions,nutrients,wastes,municateswiththeenvironmentreceptorproteinsbindsignalingmoleculesstructuralsupportcellularjunctions,anchorcytoskeletalproteins以液态的脂质双分子层为基本框架,其中镶嵌有不同生理功能的蛋白质和少量多糖。液态镶嵌模型(fluidmosaicmodel)ponentsofthecellmembraneandwhataretheirfunctions?Representationofthree-,;–junctions,cytoskeletonReceptors–bindasignalingmolecule(ligand)Enzymes–reactions(digestion,signaling)Transporters–channels,carrierproteinsFunctionsofmembraneproteins
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