NATS 1745 Lecture Notes - Lecture 15: Epithelium, Cell Adhesion, Extracellular Fluid
16 Dec 2018
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Document Summary
Scant in epithelial tissue; abundant in connective tissue -> secreted by fibroblasts: specialized cell junctions these cell junctions have specific functions and occur in specific types of cells. Notions of membrane permeability, membrane impermeability, and selective permeability. Ions channels that allow very small molecules to go through. Proteins and glucose too large for channels -> they go through assisted transport instead, meaning that something has to physically carry the proteins or glucose, thus. For vesicular transport, the concentration gradient does not matter. Rare cases where it bypasses lysosome and goes through exocytosis from other end. Endocytosis three forms always generally fuse with lysosome. Pinocytosis drinks whatever is in the area of the cell ** non selective** Form of pinocytosis macropinocytosis specialized cells that are specialized in drinking, large gulps of fluid, i. e dendritic cells in skin, organs **non selective** Specific target molecules bind to specific receptors, i. e insulin, iron, b12.
