1. Goal: To understand transport through a membrane.
Sit down facing the screen
Take out Guided Notes
Take out pen or pencil

2. Transport across the Membrane

3. Examples: Diffusion & Facilitative Diffusion
Passive Transport
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

4. Passive Transport
Created by S. DaSilva

5. Movement of water from an area of high concentrations to an area
Passive Transport
Example: Osmosis
Movement of water from an area of
high concentrations to an area
of lesser concentrations. NO ENERGY!
Created by S. DaSilva

6. Active Transport
Movement of substances from an area of lesser concentrations to an area of greater concentrations.
Requires ENERGY!

7. 2 more Examples of Active Transport Process in which the cell
Exocytosis
Process 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.

8. Endocytosis & Exocytosis

9. 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.

10. 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.

11. Cells in 3 Types of Solutions
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
Isotonic(equal)
Hypotonic(less)
Hypertonic(more)

12. Isotonic Isotonic literally translates to equal tension.
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

13. Hypertonic Solution 40% salt
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
60% water
10% salt
90% water
90% water

14. Hypotonic 1. Hypo = less Think HIPPO = cell gets large
Solute concentration of solution is lower than the solute inside the cell.
More water outside the cell.
4. Water moves into cell from solution.
5. Cell expands (and may burst)
10% salt
90% water
40% salt
60% water

15. Below: All cells are composed of 50% NaCl & 50%Water30
__%NaCL
__%Water 50
__%NaCl
__%Water
___% NaCl
___%Water 70 70 50 30

17. Iso, Hypo or Hypertonic Iso, Hypo or Hypertonic
Is there more/less solute outside the cell than inside?
2. The solution is ________tonic
Is there more/less water outside the cell than inside?
4. Will the water move in or out of the cell?
LESS
HYPO
MORE
10% water IN
90% water

18. Iso, Hypo or Hypertonic
Is there more/less/equal solute outside the cell than inside?
The solution is _____ tonic.
Is there more/less/same water outside the cell than inside?
8. Will the water move in, out or both of the cell?
EQUAL
ISO
SAME
BOTH
BACK & FORTH

19. Iso, Hypo or Hypertonic 40% water
Is there more/less solute outside the cell than inside?
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
HYPER
10% SALT
LESS
90% water
60% SALT
OUT
40% water

20. Iso, Hypo or Hypertonic 80 20% salt __% water
Is there more/less solute outside the cell than inside?
14. The solution is _____ tonic
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
50% salt ___% water 50

21. Iso, Hypo or Hypertonic
Is there more/less solute outside the cell than inside?
The solution is _____ tonic
19. Is there more or less water, outside the cell?
20. Will the water move in or out of the cell?
LESS
HYPO
90% NaCl
MORE
10% water
10% NaCl
90% water IN

22. Iso, Hypo or Hypertonic
*The produce are misted with a 100% water solution.
*Produce consists of 10% salt and 90% water.
Is there more/less solute outside
the produce than inside?
The solution is _____ tonic.
23. Is there more/less water outside
24. Will the water move in or out of the produce?
LESS
HYPO
MORE IN

23. Iso, Hypo or Hypertonic 30% NaCl 70% Water HYPER 10% NaCl OUT
The Angelfish is in 30% salt water solution.
The Angelfish is 10% Salt.
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?
30% NaCl
70% Water
HYPER
10% NaCl
90% Water
OUT

24. Iso, Hypo or Hypertonic more hyper less out
Some foods that we eat are nonsoluble(non dissolvable)
These foods stay in our large intestine.
Is there more/less solute
outside the intestinal cells
than inside?
The solution is _____ tonic.
23. Is there more/less water outside
the intestinal cells than inside?
Will the water move in or out
of the intestinal cell?
more
hyper
less
out

25. The End!!!! Congratulations