YV4-cells-4.5 Membrane transport Osmosis

• Biologie
• Middelbare school
• vwo
• Leerjaar 4

Ch 4 Cells 

4.5 Membrane transport

Osmosis 

Learning goals Osmosis

• You can explain how a membrane is built
• You can explain that a membrane is semi permeable
• You can explain how, by means of diffusion and osmosis, compounds can pass through the cell membrane
• You can explain what consequences this transport might have for cells

02:58

Where will the water go?

1. A
2. B

04:53

What are the red blood cells compared to the hypothetical pure water IV?

1. hypertonic
2. hypotonic

05:34

An animal cell placed in a hypertonic (salty) solution will:

1. shrink
2. swell
3. stay the same

04:53

Where is the higher solute concentration

1. hypothetical pure water IV
2. red blood cells

Key words

Semi permeable

Osmosis

Hypertonic - Isotonic - Hypotonic

Turgor

Plasmolysis

Write down a similarity between diffusion and osmosis.

Write down two differences between diffusion and osmosis.

Someone adds a hypertonic solution to red blood cells of cows. Eventually these cells will...

1. swell as a result of osmosis until they burst
2. shrink as a result of osmosis
3. not gain or lose any water at all

If you eat a bag of crisps...

1. the osmotic value of your blood rises
2. the osmotic value of your blood remains the same
3. the osmotic value of your blood drops

Explain why you get thirsty when you eat a bag of crisps.
Make sure you include 'osmotic value' in your answer.

Osmosis in animal cells

hypotonic solution OUTSIDE the cells

water enters the cell through osmosis, causing the cells to swell and burst

isotonic solution OUTSIDE the cells

no osmosis because there is no gradient

hypertonic solution OUTSIDE the cells

water leaves the cells through osmosis causing them to shrink

Osmosis in plant cells

hypotonic solution OUTSIDE the cells

water enters the cell through osmosis. The cells becomes rigid

TURGOR

isotonic solution OUTSIDE the cells

no osmosis because there is no gradient

hypotonic solution OUTSIDE the cells

water leaves the cell through osmosis. The cells becomes flaccid: PLASMOLYSIS

Druk op de celwand die ontstaat, omdat de cel water opneemt. De cel neemt water op indien deze hypertoon is ten opzichte van het omringende milieu. Turgor geeft stevigheid aan de plantencel.

The cell left is ....
The cell right is ....

1. left = turgid right = plasmolysed
2. left = plasmolysed right = turgid

A ... solution is added to the left sample which causes the cells to become turgid

1. hypertonic
2. isotonic
3. hypotonic

A ... solution is added to the right sample, causing the cells to become plasmolysed.

1. hypertonic
2. isotonic
3. hypotonic

Learning goals Diffusion and Osmosis

• You can explain how a membrane is built
• You can explain that a membrane is semi permeable
• You can explain how, by means of diffusion and osmosis, compounds can pass through the cell membrane
• You can explain what consequences this transport might have for cells