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Osmosis Diffusion of Water Biology 11 Ms. Lowrie

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Osmosis Diffusion of Water. Biology 11 Ms. Lowrie. Selectively Permeable Membrane. Isotonic Solution. Solute & water concentration: Equal inside and outside cell Water moves in and out equally Dynamic equilibrium Cell size: Stays the same. = solute. Hypotonic Solution. - PowerPoint PPT Presentation

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Page 1: Osmosis Diffusion of Water

OsmosisDiffusion of Water

Biology 11Ms. Lowrie

Page 2: Osmosis Diffusion of Water

Selectively Permeable Membrane

Page 3: Osmosis Diffusion of Water

Isotonic Solution

Solute & water concentration: Equal inside and outside

cell

Water moves in and out equally Dynamic equilibrium

Cell size: Stays the same

= solute

Page 4: Osmosis Diffusion of Water

Hypotonic Solution

Solute concentration: Higher INSIDE cell

Water concentration Higher OUTSIDE cell

Water moves INTO cellCell size:

Grows Think: hypo = hippo!

= solute

Page 5: Osmosis Diffusion of Water

Hypertonic Solution

Solute concentration: Higher OUTSIDE cell

Water concentration Higher INSIDE cell

Water moves OUT OF cellCell size:

Shrinks Think: hyper = sweat

= solute

Page 6: Osmosis Diffusion of Water

Osmosis in Plant Cells

Turgor pressure A type of water pressure Applies only to plant cells

When is a plant rigid or wilted? Depends on water level in

vacuoles

Page 7: Osmosis Diffusion of Water

Turgor Pressure

When high: Vacuole(s) full Pushes cytoplasm

against cell wall Keeps plants rigid

Hypotonic

When low (due to water loss): Vacuole(s) shrink Cytoplasm and cell

membrane pull away from cell wall

Plant wilts

Hypertonic OR isotonic

Page 8: Osmosis Diffusion of Water

Dangerous Water Movement!

Animal Hypotonic solution

May burst “Lysed”

Plant Hypertonic

Cell membrane pulls away from cell wall

“Plasmolysis”

Page 9: Osmosis Diffusion of Water

Extra Questions

1. What determines whether water will enter or leave a cell?

Concentration of solutes or water

2. Why will a goldfish die if it is placed in salt water?

Hypertonic situation Goldfish cells will give off water

Page 10: Osmosis Diffusion of Water

Any Questions???

Let’s review!


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