diffusion osmosis for moodle
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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/student_view0/chapter2/animation__how_diffusion_works.html
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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
Proteinchannel Lipid bilayer
Carbohydratechains
Diffusion Across the Cell Membrane
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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:
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Facilitated Diffusion
• Facilitated Diffusion– No energy required – PASSIVE TRANSPORT– Uses a protein channel in the membrane
• Molecules move from high to low concentration
HighConcentration
LowConcentration
CellMembrane
Glucosemolecules
Proteinchannel
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Osmosis
• Diffusion of water through a selectively permeable membrane (Osmosis is a form of facilitated diffusion.)
• PASSIVE TRANSPORT
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The Effects of Osmosis on CellsAs 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 HypertonicHypotonic
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Molecule tobe carried
Moleculebeing carried
Energy
Active Transport
• Requires energy• Moves materials from
area of LOW to HIGH concentration (against a concentration difference)
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Active Transport
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Diffusion, Osmosis, Facilitated Diffusion, or Active Transport?
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Diffusion, Osmosis, Facilitated Diffusion, or Active Transport?
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