DIFFUSION & OSMOSIS. Cell membranes are permeable (having pores or openings) to water, therefore,...
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Transcript of DIFFUSION & OSMOSIS. Cell membranes are permeable (having pores or openings) to water, therefore,...
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DIFFUSION&
OSMOSIS
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Cell membranes are permeable (having pores
or openings) to water, therefore, the environment the cell is exposed to can have a dramatic effect on the cell.
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Cell Membranes
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MembraneComposition
Lipids
Proteins
Question:How are the materialsarranged?
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Plasma membrane
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Question
How do materials get acrossa cell's membrane?
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•Passive Transport
•Active Transport
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Passive Transport
Movement acrossmembranes that does NOTrequire cellular energy.
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DIFFUSION
Molecules move from areas of higher
concentrations to areas of lower concentrations
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Equilibrium
When the concentration isequal on both sides.
There is no net movement ofmaterials.
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Factors that EffectDiffusion
1. Concentration
2. Temperature
3. Pressure
4. Particle size
5. Mixing
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Osmosis: the movement of water molecules from an area of high concentration to an area of low concentration.
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OSMOSIS
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Tonicity
The concentration of waterrelative to a cell.1. Isotonic (same)
2. Hypotonic (below)
3. Hypertonic (above)
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Isotonic : contains the same concentration inside & outside the cell. Water diffuses into & out of cell at the same rate.
Isotonic
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Hypotonic contains a low concentration)The water diffuses into the cell, causing the cell to swell and possibly explode.
Hypotonic
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Hypertonic : contains a high concentration The water diffuses out of the cell, causing the cell to shrivel.
Hypertonic
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Active Transport
Movement acrossmembranes that DOESrequire cellular energy.
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Forming vesicles
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Question?
How does the cell membrane know what to let in and what to let out?
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SELECTIVE PERMEABILITY
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SELECTIVE PERMEABILITY
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Summary
Know membrane structure.
Be able to discuss thevarious methods by whichcells move materials throughmembranes.
Be able to solve problems inosmosis.
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You should know & be able to explain the following points:
•Diffusion•Osmosis
•Passive & Active
Transport
•Selective Permeability
•Membrane structure