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ch. 3 3.3

lesson 3.3 vocab

TermDefinition
active transport occurs when energy is needed for a substance to move across a plasma membrane
diffusion the movement of a substance across a membrane, due to a difference in concentration, without any help from other molecules
endocytosis the type of vesicle transport that moves a substance into the cell
exocytosis the type of vesicle transport that moves a substance out of the cell
facilitated diffusion diffusion with the help of transport proteins
osmosis the diffusion of water molecules across a membrane
passive transport occurs when substances cross the plasma membrane without any input of energy from the cell
sodium-potassium pump when this pump is in operation, sodium ions are pumped out of the cell, and potassium ions are pumped into the cell
transport protein special proteins in the membrane
vesicle transport Vesicle transport requires energy, so it is also a form of active transport. There are two types of vesicle transport: endocytosis and exocytosis.
Created by: alvarlia
 

 



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