1. Diffusion and Osmosis through the Cell Membrane
Phospholipids
Semi-Permeable
Membrane Channels
Cell Membrane Transport
Diffusion
Osmosis
Hypotonic, Hypertonic and Isotonic Solutions

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3. Cell Membrane The double-layer “skin” of the cell
Keeps the cell organelles together
Controls what comes into and leaves the cell
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4. The Cell Membrane
Cells need an inside & an outside therefore, there needs to be something in between (like a wall for your house)
this separates the cell from its environment
____________ IN
food
- sugars
- proteins
- fats O2
H2O
OUT
wastes
proteins

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6. Semi-Permeable Membrane
The membrane is ____________
Things like sugars, fats, proteins, oxygen, water, salt and wastes can get through
Along with the phospholipids, there are many proteins and carbohydrates

7. Cell membrane channels
Certain substances can’t pass through the membrane (too big, water soluble, etc.) but need to get in/out
____________
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Photo Credit: Blausen.com staff. "Blausen gallery 2014". Wikiversity Journal of Medicine. DOI: /wjm/ ISSN

8. Cell Membrane Transport
The function of the cell membrane is to separate the inside of the cell from the outside while letting certain substance in and out. This is called cell membrane transport
____________

9. Tea Diffusion The tea particles spread out into the water
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10. Diffusion ____________
Molecules move from HIGH to LOW concentration
Regarding the bottom left picture. When the barrier is removed, the particles spread out. This is diffusion
Before
After

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13. Diffusion and Osmosis
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14. Keeping the water balance
There are three different situations where water is moving into and out of cells

15. Hypotonic Solution ____________
Water enters the cell by osmosis and the cell tends to swell
Example: A blood cell of a salt water fish in fresh water
high concentration of water around cell compared to inside
problem: cells gain water, swells & can burst
This is why salt water fish can’t live in fresh water

16. Hypertonic Solution ____________
Example: A blood cell of a fresh water fish in salt water
low concentration of water around cell
problem: cell loses water
Why fresh water fish can’t live in salt water

17. Isotonic Solution Balanced conditions ___________ example: blood
problem: none
volume of cell doesn’t change

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