Transport Through Cell Membranes

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Transport Through Cell Membranes

  1. 1. Transport Through Cell Membranes Rahma Dian Quratu A’yunisa (135090101111043)
  2. 2. Transport through cell membranes is 1. DIFFUSION 2. FACILITATED DIFFUSION 3. OSMOSIS 4. ACTIVE TRANSPORT
  3. 3. DIFFUSION Diffusion is the spontaneous movement of molecules (or ions) from a region of their high concentration to a region of their lower concentration.
  4. 4. Diffusion through a membrane Cell membrane Inside cell Outside cell
  5. 5. Diffusion through a membrane Cell membrane diffusion Inside cell Outside cell
  6. 6. Diffusion through a membrane Cell membrane Inside cell Outside cell EQUILIBRIUM
  7. 7. What determines the rate of diffusion? There 4 factors: 1. The steepness of the concentration gradient. 2. Temperature. 3. The surface area. 4. The type of molecule or ion diffusing.
  8. 8. The steepness of the concentration gradient The bigger the difference between the two sides of the membrane the quicker the rate of diffusion.
  9. 9. Temperature Higher temperatures give molecules or ions more kinetic energy. Molecules move around faster, so diffusion is faster.
  10. 10. The surface area The greater the surface area the faster the diffusion can take place. This is because the more molecules or ions can cross the membrane at any one moment.
  11. 11. The type of molecule or ion diffusing Large molecules need more energy to get them to move so they tend to diffuse more slowly. Non-polar molecules diffuse more easily than polar molecules because they are soluble in the non polar phospholipid tails.
  12. 12. FACILIATED DIFFUSION Facilitated diffusion is a type of Passive transport that allows substances to cross membranes with The assistance of special transport proteins. Some molecules and ions such as glucose, sodium ions and chloride ions are unable to pass through the lipid bilayer of cell membranes.
  13. 13. Facilitated Diffusion through a membrane Cell membrane Protein channel Inside cell Outside cell
  14. 14. Facilitated Diffusion through a membrane Cell membrane diffusion Protein channel Inside cell Outside cell
  15. 15. Facilitated Diffusion through a membrane Cell membrane diffusion Protein channel Inside cell Outside cell EQUILIBRIUM
  16. 16. OSMOSIS Osmosis is the spontaneous movement of free water down its concentration gradient. Water flows across membranes from regions with higher water potential (high concentration of water molecules) to regions with lower (low concentration of water molecules) across a partially permeable membrane.
  17. 17. Osmosis DILUTE SOLUTION CONCENTRATED SOLUTION Cell membrane partially permeable. Sugar molecule VERY Low conc. of water molecules. High water potential. Inside cell VERY High conc. of water molecules. High water potential. Outside cell
  18. 18. Osmosis Cell membrane partially permeable. OSMOSIS Inside cell High conc. of water molecules. High water potential. Outside cell Low conc. of water molecules. High water potential.
  19. 19. Osmosis Cell membrane partially permeable. OSMOSIS Inside cell Outside cell AS Biology, Cell membranes and Transport
  20. 20. Active Transport Active transport is the movement of all types of molecules across a cell membrane against its concentration gradient (from low to high concentration).

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