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DIFFUSION & OSMOSIS. Cell membranes are permeable (having pores or openings) to water, therefore, the environment the cell is exposed to can have a dramatic.

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Presentation on theme: "DIFFUSION & OSMOSIS. Cell membranes are permeable (having pores or openings) to water, therefore, the environment the cell is exposed to can have a dramatic."— Presentation transcript:

1 DIFFUSION & OSMOSIS

2 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.

3 Cell Membranes

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5 Plasma membrane

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8 Passive Transport Active Transport

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11 DIFFUSION Molecules move from areas of higher concentrations to areas of lower concentrations

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16 Osmosis: the movement of water molecules from an area of high concentration to an area of low concentration.

17 OSMOSIS

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19 Isotonic : contains the same concentration inside & outside the cell. Water diffuses into & out of cell at the same rate. Isotonic

20 Hypotonic contains a low concentration) The water diffuses into the cell, causing the cell to swell and possibly explode. Hypotonic

21 Hypertonic : contains a high concentration The water diffuses out of the cell, causing the cell to shrivel. Hypertonic

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30 Question? How does the cell membrane know what to let in and what to let out?

31 SELECTIVE PERMEABILITY

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34 You should know & be able to explain the following points: DiffusionOsmosis Passive & Active Transport Selective Permeability Membrane structure


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