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:
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.
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.
Isotonic : contains the same concentration inside & outside the cell. Water diffuses into & out of cell at the same rate. Isotonic
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?
You should know & be able to explain the following points: DiffusionOsmosis Passive & Active Transport Selective Permeability Membrane structure