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Lecture 6
terms
23
Psychology
Undergraduate 3
02/02/2013

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Term
Membrane
Definition
Define bountary of the cell and its internal compartments
Term
4 Membrane functions
Definition
-regulate the passage of substances into anf out of cells and between cell organelles and cytosol
-detect chemical messages arriving at the cell surface
-link adjacent cells together by membrane junctions
-anchor cells to the extracellular matrix
Term
Fluid Mosaic Model
Definition
model for the structure of all membranes
classified by how things attach and not the function
Term
Amphipathic
Definition
having a polar and nonpolar region like phospholipids
Term
Phospholipid
Definition
amphipathic molecule consisting of a glycerol backbone to which two fatty acids and a phosphate-containingchemicla group are attached
Term
Phosphoglyceride
Definition
most common phospholipid
Glyceral based
Term
Sphingolipid
Definition
Sphingosine based phospholipid
Term
integral Protein
Definition
Attached to the membrane by being in contact with the hydrophobic core of the bilayer
they are difficult to remove
most common are transmembrane proteins
span the lipid bilayer
Term
Transmembrane protein
Definition
intergral protein that spans the lipid bilayer, with surface exposed to both the cytosol and interstitial fluid
Term
peripheral protein
Definition
Are attached to the hyrophilic surface of the membrane by hydrogen and ionic bonds
easy to remove b/c they are attached to other proteins or membrane lipids
Term
Passive Transport
Definition
does not require energy
move from greater concentration to lower concentration
Term
Active Transport
Definition
Requires energy
move from lower concentration to higher concentration
Term
Diffution
Definition
passive movement of molecules from one location to another as a result of their own thermal motion
Term
Simple Diffusion
Definition
passive movement of molecules in response to chemical or electrical forces
Term
Chemical Driving Force
Definition
Difference in energy due to the concentration gradient that causes a molecule to move from an area of high concentration to an area of low concentration
Term
Concentration Gradient
Definition
(difference in concentration)
difference in teh concentration of a substance between regions
Term
Electrical Driving Force
Definition
difference in energy due to a seperation of charge that acts to move ions from high energy to low energy
Term
Membrane Potential
Definition
The difference in electric potential or voltage that appears across the membrane of most cells
Term
ion
Definition
charged atoms or molecule
Term
Cation
Definition
Positively charged atoms or molecule
Term
Anion
Definition
negatively charged atoms or molecule
Term
Electrical Potential
Definition
Form of potential energy
electric force acting on charged particels and has the potential to cause those particles to move
Term
Electrochemical Driving Force
Definition
the sum of the chemical and electrical driving force
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