Physiology 2130 Lecture Notes - Lecture 3: Lipid Bilayer, Facilitated Diffusion, Osmosis
8 Dec 2016
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Module #3 the cell (sections 3. 1 to 3. 39) Learning objectives: make a diagram of a cell membrane, showing the two parts of the phospholipid bilayer, the positions of membrane proteins, cholesterol, and carbohydrate moieties, discuss the permeability of the lipid bilayer. The lipid bilayer is made up of phospholipid molecules which have a fatty acid. Hydrophobic they are the major barrier to water and water-soluble substances. Fat-soluble substances can penetrate this portion of the membrane with ease since. Diffusion is the movement of molecules from high concentration to low. Concentration due to the molecules random thermal motion. Charged molecules tend to move down their electrical gradient. More down both their chemical concentration gradient and electrical gradient. Ion swill stop moving once the molecules reach electrochemical equilibrium (when the electrical force is equal to and in opposite direction of the chemical. Substances that are lipid soluble can pass through the cell membrane.
