4.1 Cell Surface细胞表面之结构：细胞被(cellcoat)：又称糖萼（glycocalyx）细胞质膜表层胞质溶胶（corticalcytosol)：主要是膜骨：与教材不同架(membraneskeleton)：1
细胞被：Glycocalyx---糖萼组成：碳水化合物（糖蛋白和蛋白聚糖）多糖包被功能：Cushions the plasma membrane and protects it from physicalProtectionand chemical injury.Immunity ToEnables the immune system to recognize and selectively attackInfectionforeign organisms.DefenseAgainstChanges in the glycocalyx of cancerous cells enable the immuneCancersystem torecognize and destroy them.TransplantForms the basis for compatibility of blood transfusions,tissueCompatibilitygrafts, and organ transplants.CellAdhesionBinds cells together so that tissues do not fall apart.FertilizationEnables sperm to recognize and bind to eggs.EmbryonicGuides embryonic cells to their destinations in the bodyDevelopment
Protection Cushions the plasma membrane and protects it from physical and chemical injury. Immunity To Infection Enables the immune system to recognize and selectively attack foreign organisms. Defense Against Cancer Changes in the glycocalyx of cancerous cells enable the immune system to recognize and destroy them. Transplant Compatibility Forms the basis for compatibility of blood transfusions, tissue grafts, and organ transplants. Cell Adhesion Binds cells together so that tissues do not fall apart. Fertilization Enables sperm to recognize and bind to eggs. Embryonic Development Guides embryonic cells to their destinations in the body
糖被的结构和组成附着糖蛋白跨末蛋白聚糖糖被有一定独立跨膜糖蛋白糖单位-性，去除后并不直接糖被损伤质膜。质膜与细细胞外胞外被一一“皮”与糖脂空间“毛”的关系。脂双层被细胞质细腿质膜200nm电镜观察淋巴细胞糖被
电镜观察淋巴细胞糖被
+表层胞质溶胶(corticalcytosol）：具有细胞骨架成分组成的网络结构，除对质膜有支持作用外，还与维持质膜的功能有关，这部分细胞骨架又称为膜骨架。胞质溶胶：细胞质中除细胞器以外的液体部分。富含蛋白质，占细胞内的25～50%；含有多种酶，是细胞代谢活动的场所；还有各种细胞内含物，如肝糖原、脂肪细胞的脂肪滴、色素粒等
胞质溶胶：细胞质中除细胞器以外的液体部分。富含蛋白质，占 细胞内的25～50%；含有多种酶，是细胞代谢活动的场所；还有 各种细胞内含物，如肝糖原、脂肪细胞的脂肪滴、色素粒等
细胞表面之功能：保护细胞，使细胞有一个相对稳定的内环境参与细胞内外的物质交换和能量交换参与信号的识别和信息的传递参与细胞运动：维护细胞的各种形态：与免疫、癌变等有十分密切关系