PSYC 2410 Study Guide - Final Guide: Myelin, Resting Potential, Active Transport
8 Dec 2015
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Polar head (glycerol phosphate) hydrophilic (water-loving) Two nonpolar fatty acid tails hydrophobic (water-fearing) Nonpolar areas from a hydrophobic region between the hydrophilic heads. Ay body temperatures the interior of the bilayer is fluid. Peripheral membrane proteins: have hydrophobic and hydrophilic regions, signal proteins, and channel proteins, nontransmembrane proteins, extracellular or intracellular side of transmembrane proteins, they facilitate chemical reactions (usually enzymes, can help the functions of transmembrane proteins. Lipids of membrane form a barrier to hydrophilic molecules o: substances go through, diffusion o, active transport: requires energy consumption (mitochondria, passive processes: no energy consumption. Movement of substance (liquid or gas) along a concentration gradient. Membrane potential: difference in electrical charge between the inside and the outside of a cell. Neuronal resting potential: -70 mv (inside more negative than outside) Sodium: na+, potassium: k+, chloride cl-, protein ions . Sodium na+ and chloride cl- = more concentrated outside the cell (physiological saline)
