Movement of substances across the cell membrane

• Simple diffusion

  • High concentration -> low concentration
  • Tries to acheive an even distribution
  • Passive transport

  
• Osmosis

  • Movement of water from high concentration -> low concentration
  • The diffusion of water
  • Passive transport
  • Usually uses channel proteins
• Facilitated diffusion

  • High -> low concentration
  • Uses proteins
• Vesicular transport

  • Movement of substances across the membrane in sacs called vesicles
  • 2 types - Exocytosis, Endocytosis
  • Active transport
• Phagocytsis

  • Cell eating
  • When material taken into the cell is solid
• Pinocytosis

  • Cell drinking
  • When material taken into the cell is liquid
• Endocytosis

  • The taking in of a substance using a vesicle

  
• Excocytosis

  • The movement of a substance out of the cell

  
• Active transport

  • When a substance moves from low -> high concentration
  • Usually uses carrier proteins

  
• Facilitated transport

  • When proteins in the membrane help move molecules across the cell membrane
  • Can be active or passive transport