Transport across the Membrane

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!!!

Created by S. DaSilva

Created by S. DaSilva

• Example: Osmosis• Movement of water from an area of high concentrations to an area of lesser concentrations. NO ENERGY!

– Movement of substances from an area of lesser concentrations to an area of greater concentrations.

– Requires ENERGY!

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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.

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.

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.

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

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

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

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

Below: All cells are composed of 50% NaCl & 50%Water

___% NaCl

___%Water

__%NaCL

__%Water

__%NaCl

__%Water

30

70 50

50 70

30

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

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

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

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

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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

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

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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

The End!!!!

Congratulations