Osmosis SWBAT describe how osmosis affects the homeostasis of a cell.

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Presentation transcript:

Osmosis SWBAT describe how osmosis affects the homeostasis of a cell

Starter What is diffusion? Give an example. What do the following prefixes mean? – Iso – Hyper – Hypo Can a fresh-water fish survive in the ocean? Can an ocean fish survive in fresh water?Why or why not?

Osmosis Osmosis is the diffusion of water across a membrane Water molecules move from high concentration (where there’s more water) to low concentration (where there’s less water) Remember: “Water follows salt!”

Situations Affecting Osmosis The amount of dissolved solute in the substance around a cell determines the direction water moves Isotonic: Substance and cell have the same amount of dissolved solute Hypertonic: Substance has more dissolved solute than cell Hypotonic: Substance has less dissolved solute than cell

Effects of Osmosis on Cells Substance DescriptionEffect on Cell Isotonic Hypertonic Hypotonic