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Filtration, Diffusion, and
Osmosis
Jo Patrick Mabelin
BS Biology 3
Diffusion
• Movement of particles
• Concentration of substances differ from one
point to another
• High concentration to L...
• Factors affecting diffusion rate through a
membrane
▫ temperature - ↑ temp., ↑ motion of particles
▫ molecular weight - ...
Membrane Permeability
• Diffusion through lipid bilayer
• Diffusion through channel proteins
▫ Cells control permeability ...
Osmosis
• Flow of water through selectively permeable
membrane
• From: Side of higher water concentration
• To: Side of lo...
• Aquaporins: Channel proteins in the plasma
membrane specialized for the passage of water
• Cells increase rate of osmosi...
Osmotic Pressure
• Amount of hydrostatic pressure to stop osmosis
• Osmosis Slows due to hydrostaitc pressure
Filtration
• Water molecules and extremely small solutes are
forced to move through a selectively permeable
membrane by a ...
Tonicity
• ability of a solution to affect fluid volume and
pressure in a cell
• depends on concentration and permeability...
Hypotonic Solution
• High solvent concentration
• Cells absorb water, swell, and may burst
Hypertonic
• High solute concentration
• Cells lose water and shrivel
Isotonic
• Concentration of solute and solvent are level
• No changes in cell volume and shape
Filtration, diffusion, and osmosis
Filtration, diffusion, and osmosis
Filtration, diffusion, and osmosis
Filtration, diffusion, and osmosis
Filtration, diffusion, and osmosis
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Filtration, diffusion, and osmosis

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Filtration, diffusion, and osmosis

  1. 1. Filtration, Diffusion, and Osmosis Jo Patrick Mabelin BS Biology 3
  2. 2. Diffusion • Movement of particles • Concentration of substances differ from one point to another • High concentration to Low concentration
  3. 3. • Factors affecting diffusion rate through a membrane ▫ temperature - ↑ temp., ↑ motion of particles ▫ molecular weight - larger molecules move slower ▫ steepness of concentrated gradient - ↑difference, ↑ rate ▫ membrane surface area - ↑ area, ↑ rate ▫ membrane permeability - ↑ permeability, ↑ rate
  4. 4. Membrane Permeability • Diffusion through lipid bilayer • Diffusion through channel proteins ▫ Cells control permeability by regulating:  Number of channel proteins  Opening or closing gates
  5. 5. Osmosis • Flow of water through selectively permeable membrane • From: Side of higher water concentration • To: Side of lower water concentration • Movement from lower solute concentration to higher solute concentration
  6. 6. • Aquaporins: Channel proteins in the plasma membrane specialized for the passage of water • Cells increase rate of osmosis by installing more aquaporins
  7. 7. Osmotic Pressure • Amount of hydrostatic pressure to stop osmosis • Osmosis Slows due to hydrostaitc pressure
  8. 8. Filtration • Water molecules and extremely small solutes are forced to move through a selectively permeable membrane by a hydrostatic pressure
  9. 9. Tonicity • ability of a solution to affect fluid volume and pressure in a cell • depends on concentration and permeability of solute
  10. 10. Hypotonic Solution • High solvent concentration • Cells absorb water, swell, and may burst
  11. 11. Hypertonic • High solute concentration • Cells lose water and shrivel
  12. 12. Isotonic • Concentration of solute and solvent are level • No changes in cell volume and shape

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