PSYC 2110 Chapter Notes -Tonicity, List Of Lakes By Volume, Electrochemical Gradient
9 Oct 2012
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Document Summary
Ch 3: the plasam membrane and membrane potential. Phospholipids: the most abundant lipid in the membrane (have a non-polar tail and polar heads: made of a phosphate group (head) and 2 nonpolar fatty acid tails. Membrane proteins: inserted in the lipid bilayer proteins are larger than lipids so they account for half of the mass of the membrane, although there are 50 times more lipids. Fluid mosaic model: the membrane is fluid and looks mosaic bc of the different shaped proteins. Hydrophobic interior: barrier for passage of water-soluble substances from the ecf cell can maintain what goes in and out. Membrane proteins different specialized proteins are used for different fn"s. Channels: used for small, water-soluble things to pass without going through the nonpolar barrier there are highly selective. Carrier molecules: transfer things across the membrane that cant go alone can transport a particular molecule or one that resembles it.
