PLASMA MEMBRANE STRUCTURE AND FUNCTION TRANSPORT ACROSS MEMBRANE.
Transport across the Membrane
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Transcript of Transport across the Membrane
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Created by S. DaSilva
• Examples: Diffusion & Facilitative Diffusion
• Movement of substances from an area of higher concentrations to an area of lesser concentrations.
NO ENERGY is needed!!!
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Created by S. DaSilva
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Created by S. DaSilva
• Example: Osmosis• Movement of water from an area of high concentrations to an area of lesser concentrations. NO ENERGY!
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– Movement of substances from an area of lesser concentrations to an area of greater concentrations.
– Requires ENERGY!
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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• ExocytosisProcess in which the cell expels large particles (waste matter) out of the cell. Exo = exit
• Endocytosis
Process in which the cell engulfs large particles (food)into the cell.
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Homeostasis
The cell membrane, using passive and active transport, determines what gets into or out of the cell.
The selective flow of material helps the cell to maintain constant internal conditions: called Homeostasis.
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Solution• a solution is a
homogeneous mixture composed of two parts.
• a common example is a solid, such as salt or sugar, dissolved in water.
• Solvent-the part that does the dissolving, usually larger.
• solute-the part that dissolves, usually smaller.
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Cells in 3 Types of Solutions
1. Isotonic(equal)
2. Hypotonic(less)3. Hypertonic(more)
• When talking about types of solution, always think about the solution outside the cell.
• Ask the question does the solution have an equal, more or less solute outside the cell than inside.
• Iso-Hypo-Hyper?????• Then figure out if the there
is more or less water outside the cell than inside.
• Osmosis - water moves from greater to lesser
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Isotonic1. Isotonic literally translates
to equal tension.
2. Solute concentration of solution outside the cell is equal to that inside the cell.
Iso-Hypo-Hyper?????
3. Water concentration is equal inside & outside the cell
4. No net water movement
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Hypertonic Solution
1. Solute concentration of solution is higher outside the cell than inside.
2. Hyper = more (think hyperactive).
3. Less water outside the cell than inside.
4. Water moves out of cell into solution ・ Cell shrinks
90% water
60% water40% salt
90% salt10% water
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1. Hypo = less
Think HIPPO = cell gets large
2. Solute concentration of solution is lower than the solute inside the cell.
3. More water outside the cell.
4. Water moves into cell from solution.
5. Cell expands (and may burst)
Hypotonic
10% salt
40% salt60% water
90% water
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Below: All cells are composed of 50% NaCl & 50%Water
___% NaCl
___%Water
__%NaCL
__%Water
__%NaCl
__%Water
30
70 50
50 70
30
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1. Is there more/less solute outside the cell than inside?
2. The solution is ________tonic
3. Is there more/less water outside the cell than inside?
4. Will the water move in or out
of the cell?
Iso, Hypo or HypertonicIso, Hypo or Hypertonic
LESSHYPO
MORE
IN
10% water
90% water
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Iso, Hypo or Hypertonic5. Is there more/less/equal solute outside the cell
than inside?
6. The solution is _____ tonic.
7. Is there more/less/same water outside the cell than inside?
8. Will the water move in, out or both of the cell?
ISO
SAME
BOTHBACK & FORTH
EQUAL
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Iso, Hypo or Hypertonic9. Is there more/less solute
outside the cell than inside?
10. The solution is _____ tonic.
11. Is there more/less water outside the cell than inside?
12. Will the water move in or out of the cell?
MORE
10% SALT
HYPER
LESS
OUT60% SALT 10% water
90% water
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Iso, Hypo or Hypertonic13. Is there more/less solute
outside the cell than inside?
14. The solution is _____ tonic
15. Is there more/less water,outside the cell than inside?
16. Will the water move in or out of the cell?
MORE
HYPER
LESS
OUT
QuickTime™ and a decompressor
are needed to see this picture.
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Iso, Hypo or Hypertonic17. Is there more/less solute
outside the cell than inside?
18. The solution is _____ tonic
19. Where is there more water, outside the cell or inside?
20. Will the water move in or out of the cell?
90% NaCl
10% NaCl
LESS
HYPO
OUTSIDE
IN
10% water
10% water
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Iso, Hypo or Hypertonic*The produce are misted with a 100% water solution.*Produce consists of 10% salt and 90% water.
21. Is there more/less solute outside the produce than inside?
22. The solution is _____ tonic.
23. Is there more/less water outside the produce than inside?
24. Will the water move in or out of the produce?
LESSHYPO
MORE
IN
QuickTime™ and a decompressor
are needed to see this picture.
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Iso, Hypo or HypertonicThe Angelfish is 2% Salt.
The Angelfish is in 30% salt water solution.
There is less water outside the fish than inside.
25. The solution is___________tonic
26. Will the water move in or out of the Angelfish?
OUT
HYPER
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The End!!!!
Congratulations