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Biology-4-Transport Across Cell Membranes > Osmosis > Flashcards

Flashcards in Osmosis Deck (10)
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1

What is osmosis

The passage of water from a region where it has a high water potential to a region where it has lower water potential through a selectively permeable membrane

2

What’s a solute

Any substances that is dissolved in a solvent

3

What does the addition of a solute do to pure water

If lowers water potential

4

What value must the water potential of a solution always be

Below 0

5

If more solute is added, what happens to the water potential

Becomes more negative

6

What happens now osmosis in red blood cells

If a red blood cell is placed in water it will absorb the water by osmosis because it has a lower water potential.

To prevent the cell surface breaking and bursting the cell and releasing its contents. Animal cells normally live in a liquid which has the same water potential

7

What happens if a red blood cell is placed in a water potential lower then it’s own

If a red blood cell is placed in a Solution with a water potential lower than its own, water leaves by osmosis and the cell shrinks and becomes shrivelled

8

What’s the plant cell like when the water potential is higher

The protoplast swells

It becomes turgid ( protoplast pushed against cell wall)

9

What’s the plant cell like when the water potential is equal

No change in protoplast

Cell becomes incipient plasmolysis - protoplast beginning to pull away from the cell wall

10

What’s the plant cell like when the water potential is lower

Protoplast shrinks

Cell becomes plasmolysed - protoplast completely pulled away from the cell wall