Diffusion
• Particles are always
moving
• Particles move from areas
of high concentration to
low concentration
• Particles...
Proteins
Recall the
structure of the
cell membrane…
• Selectively permeable = semipermeable
– Regulates what enters and ex...
Diffusion Across the Cell Membrane
• Cell membranes are selectively-permeable - they allow
some materials to pass across, ...
Facilitated Diffusion
• Facilitated Diffusion
– No energy required – PASSIVE TRANSPORT
– Uses a protein channel in the mem...
Osmosis
• Diffusion of water through a selectively permeable
membrane (Osmosis is a form of facilitated diffusion.)
• PASS...
The Effects of Osmosis on Cells
As a result of osmosis, cells respond differently when the
water concentration inside the ...
Molecule to
be carried
Molecule
being carried
Energy
Active Transport
• Requires energy
• Moves materials from
area of LOW...
Active Transport
Diffusion, Osmosis, Facilitated Diffusion,
or Active Transport?
9
Diffusion, Osmosis, Facilitated Diffusion,
or Active Transport?
10
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Diffusion Osmosis for Moodle

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Diffusion Osmosis for Moodle

  1. 1. Diffusion • Particles are always moving • Particles move from areas of high concentration to low concentration • Particles move until equilibrium is reached • Particles move passively – No energy (ATP) required – PASSIVE TRANSPORT http://highered.mcgraw- hill.com/sites/0072495855/stud ent_view0/chapter2/animation_ _how_diffusion_works.html
  2. 2. Proteins Recall the structure of the cell membrane… • Selectively permeable = semipermeable – Regulates what enters and exits the cell • Lipid bilayer (two layers of lipids = fats) • “Mosaic Model” – Contains many types of proteins, pumps, channels, and receptors Inside of cell (cytoplasm) Outside of cell Protein channel Lipid bilayer Carbohydrate chains Diffusion Across the Cell Membrane
  3. 3. Diffusion Across the Cell Membrane • Cell membranes are selectively-permeable - they allow some materials to pass across, but not others (also called semipermeable) • If the membrane is permeable to a substance, movement of that substance (solute) will occur as shown in the diagram below:
  4. 4. Facilitated Diffusion • Facilitated Diffusion – No energy required – PASSIVE TRANSPORT – Uses a protein channel in the membrane • Molecules move from high to low concentration High Concentration Low Concentration Cell Membrane Glucose molecules Protein channel
  5. 5. Osmosis • Diffusion of water through a selectively permeable membrane (Osmosis is a form of facilitated diffusion.) • PASSIVE TRANSPORT
  6. 6. The Effects of Osmosis on Cells As a result of osmosis, cells respond differently when the water concentration inside the cell is equal to, greater than, or less than the water concentration in the environment. Isotonic Hypertonic Hypotonic
  7. 7. Molecule to be carried Molecule being carried Energy Active Transport • Requires energy • Moves materials from area of LOW to HIGH concentration (against a concentration difference)
  8. 8. Active Transport
  9. 9. Diffusion, Osmosis, Facilitated Diffusion, or Active Transport? 9
  10. 10. Diffusion, Osmosis, Facilitated Diffusion, or Active Transport? 10

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