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3.3 Cell Transport a

QuestionAnswer
active transport an energy-driven process where membrane proteins transport molecules across cells
diffusion Diffusion is the movement of a substance across a membrane, due to a difference in concentration, without any help from other molecules.
endocytosis Endocytosis is the type of vesicle transport that moves a substance into the cell.
exocytosis Exocytosis is the type of vesicle transport that moves a substance out of the cell.
facilitated diffusion Diffusion with the help of transport proteins is called facilitated diffusion.
osmosis Osmosis is a special type of diffusion — the diffusion of water molecules across a membrane.
passive transport 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 The help comes from special proteins in the membrane known as transport proteins.
vesicle transport Vesicle transport requires energy, so it is also a form of active transport.
Created by: Jay000
 

 



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