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Cell Transport

Biology

TermDefinition
Phospholipid bilayer a term used to describe the structure of the cell membrane
Passive Transport movement of small and uncharged molecules (ions)molecule in and out of a cell without the use of ATP energy....molecules move form an area of high to low concentration
Active Transport movement of large molecules (like protein, salt, and starch) into and out of a cell
Diffusion type of passive transport (movement of gases) into and out of the cell
Osmosis type of passive transport (movement of water) into and out of the cell
Facilitated Diffusion type of passive transport (movement of glucose) into and out of the cell...requires a transfer protein
Endocytosis a type of active transport in which a cell engulfs particles from its environment and stores them inside a vesicle
Phagocytosis a type of endocytosis used by a white blood cell to destroy bacteria
Exocytosis a type of active transport in which a vesicle attached to the cell membrane release particles into its environment
Pinocytosis a type of endocytosis a cell uses to engulf liquid from its environment
Phospholipid a type of lipid that forms the cell membrane...it is made up of a glycerol attached to two fatty acids
Hydrophobic region ("water fearing")...a term used to describe the inner portion of the cell membrane made up of fatty acid tails that repel water
Hydrophilic region ("water loving")...a term used to describe the outer portion of the cell membrane made up of glycerol molecules
Glycerol the hydrophilic head of a phospholipid
Fatty acids the hydrophobic tails of a phospholipid
Receptor protein a specialized protein located on the surface of a cell membrane that receives signals from the cell's environment
Semi-permeable a term used to describe the cell membrane's ability to allow only small molecules to freely pass through the membrane without the use of energy
Cholesterol a type of lipid that provides flexibility to the cell membrane
Concentration gradient the state of having unequal amounts of a specific molecule inside compare to outside the cell
Equilibrium the state of having equal amounts of a specific molecule inside compared to outside the cell....this state is only reached during passive transport
Isotonic solution a cell placed in this solution will remain the same size due to osmosis
Hypertonic solution a cell will lose water by osmosis when placed in this type of solution, causing the cell membrane to shrivel
Hypotonic solution a cell will gain water by osmosis when placed in this type of solution, causing the cell membrane to expand
Created by: gmottola
 

 



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