2016年互联网 电力 智能电网智慧电网整体运营解决方案.ppt

文档介绍：第二章细胞的基本功能
南京医科大学生理学系
朱国庆
Cell
(endoplasmic reticulum)
一、细胞膜的基本结构(cell structure)
细胞膜或质膜(plasma membrane)
第一节细胞膜的结构和物质转运功能
Why have a cell membrane?
isolate the cell  cytosol (intracellular fluid) from extracellular fluid
regulate exchange with the environment  ions, nutrients, wastes, secretions
municates with the environment receptor proteins bind signaling molecules
structural support  cellular junctions, anchor cytoskeletal proteins
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(fluid mosaic model)
What are ponents of the cell membrane and what are their functions?
Representation of three-anization of plasma membranes. A bimolecular film of phospholipids forms the matrix of the membrane, and globular proteins are embedded in the lipid core. Some proteins span the membrane; others are embeded in one of the lipid monolayers.
Structu