DIFFUSION & OSMOSIS.

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Presentation transcript:

DIFFUSION & OSMOSIS

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.

Cell Membranes

Plasma membrane

Passive Transport Active Transport

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

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

OSMOSIS

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

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

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

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

SELECTIVE PERMEABILITY

SELECTIVE PERMEABILITY

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