Transport

• Simple Diffusion 


  Movement of molecules from an area of high concentration to an area of low concentration, passive
• Facilitated Diffusion


  Movement of molecules through a protein channel from an area of high concentration to an area of low concentration, passive
• Osmosis


  Free water molecules moving through a semi permeable membrane to an area of high concentration to an area of low concentration, passive
• Active Transport


  Molecules moving from an area of low concentration to an area of high concentration, moving against the concentration gradient, needs energy
• Endocytosis


  Cell membrane enclosing on a substance, trapping it in a vesicle, bringing it into the cell, needs energy
• Exocytosis


  A substance in a vesicle fuses to the cell membrane, and is released to the outside of the cell, needs energy