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Section 8.1 Summary – pages 195 - 200 Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. Osmosis:

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Presentation on theme: "Section 8.1 Summary – pages 195 - 200 Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. Osmosis:"— Presentation transcript:

1 Section 8.1 Summary – pages 195 - 200 Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. Osmosis: Diffusion of Water In a cell, water always moves to reach an equal concentration on both sides of the membrane.

2 Section 8.1 Summary – pages 195 - 200 Most cells whether in multicellular or unicellular organisms, are subject to osmosis because they are surrounded by water solutions. Cells in an isotonic solution H2OH2O H2OH2O Water Molecule Dissolved Molecule

3 Section 8.1 Summary – pages 195 - 200 Cells in an isotonic solution In an isotonic solution, the concentration of dissolved substances in the solution is the same as the concentration of dissolved substances inside the cell. H2OH2O H2OH2O Water Molecule Dissolved Molecule

4 Section 8.1 Summary – pages 195 - 200 Cells in an isotonic solution In an isotonic solution, water molecules move into and out of the cell at the same rate, and cells retain their normal shape. H2OH2O H2OH2O Water Molecule Dissolved Molecule

5 Section 8.1 Summary – pages 195 - 200 Cells in an isotonic solution A plant cell has its normal shape and pressure in an isotonic solution.

6 Section 8.1 Summary – pages 195 - 200 Cells in a hypotonic solution In a hypotonic solution, water enters a cell by osmosis, causing the cell to swell. H2OH2O H2OH2O Water Molecule Dissolved Molecule

7 Section 8.1 Summary – pages 195 - 200 Cells in a hypotonic solution Plant cells swell beyond their normal size as pressure increases.

8 Section 8.1 Summary – pages 195 - 200 Cells in a hypertonic solution In a hypertonic solution, water leaves a cell by osmosis, causing the cell to shrink. H2OH2O H2OH2O Water Molecule Dissolved Molecule

9 Section 8.1 Summary – pages 195 - 200 Cells in a hypertonic solution In a hypertonic solution, water leaves a cell by osmosis, causing the cell to shrink. H2OH2O H2OH2O Water Molecule Dissolved Molecule

10 Section 8.1 Summary – pages 195 - 200 Cells in a hypertonic solution Plant cells lose pressure as the plasma membrane shrinks away from the cell wall.

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12 EGG –Cellent Osmosis Lab

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