difusi dan osmosis

1. Diffusion and Osmosis

2. • Diffusion - the tendency of molecules to move
from a higher concentration to a lower
concentration until equilibrium is reached.
Higher concentration on
the left
Equilizing out
Equal on
right & left
Fully
diffused

3. Diffusion video

4. Passive Transport
• Diffusion across a semi-permeable
membrane (ex: cell membrane).
• Cell does not use any energy for
diffusion. It goes through the cell
membrane without it opening up.
• Examples – water, alcohol, O2 and CO2,
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5. • Osmosis - The diffusion of water
• Cell membrane doesn’t open up, just goes through.
Only works with very small particles.
Osmosis Video
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decompressor
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6. Hypertonic
Solution
• Solution with a
higher concentration
of solute and a lower
concentration of
water.
• Makes the cell
shrivel. Example:
adding salt water
Video Link

7. Hypotonic Solution
• Solution with a lower
solute concentration
and a higher water
concentration.
• More water moves in
than out. Cell bloats.
Example: Being in the
bath too long causes
wrinkled fingers.
Video link

8. Isotonic Solution
• Equal amount of
water goes in and
out of cell.
Video link

9. Effect on living cells
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QuickTime™ and a
TIFF (Uncompressed) decompressor
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10. Active Transport
• Cell uses energy to move things in and out.
Example: food molecules
• Cell membrane actually opens and closes.
QuickTime™ and a
TIFF (Uncompressed) decompressor
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Active Transport Video

11. Exocytosis & Endocytosis
Endocytosis (substances
“enter” the cell).
Ex: Food molecules
Exocytosis (molecules
“exit” the cell.
Ex: Waste products