1. Cell boundaries
-and cell transport-

2. The Cell Membrane
The cell membrane is a selectively permeable, fluid mosaic, phospholipid bilayer!

3. The Cell Membrane
selectively permeable - some stuff can get in (water); other stuff cannot get in without help (big molecules and charged molecules)

4. molecules are in constant motion
The Cell Membrane
fluid means the
molecules are in constant motion
Mosaic means it is made of individual pieces that form the membrane

5. The Cell Membrane
Phospholipid – phosphate and lipid bilayer - 2 layers of phospholipids; hydrophobic tails pointed inward

6. The Cell Membrane
Also has protein tunnels and channels, carbohydrate "markers", and many other embedded molecules

7. The Cell Membrane
Functions: 1. regulates what enters & exits the cell 2. protection 3. support

8. Found in: plants algae fungi bacteria The Cell Wall Function: -support
-protection
Found in:
plants
algae
fungi
bacteria

9. Passive transport (no energy required) Active transport
Cell transport
Moving small particles:
Passive transport
(no energy required)
Active transport
(energy required)

10. Moving small particles:
Cell transport
Moving small particles:

11. Cell transport
Passive Transport:
Diffusion: movement of molecules from an area of high concentration to an area of low concentration

12. Cell transport
Passive Transport:
Diffusion:

13. Passive Transport: Diffusion examples: Air freshener Fresh baked bread
Cell transport
Passive Transport:
Diffusion examples:
Air freshener
Fresh baked bread
Smelly candle

14. Passive Transport: Osmosis: the diffusion of water Cell transport
The water moves from high to low concentration

15. Passive Transport: Cell transport Osmosis: the side with less sugar
has a higher
concentration
of water

16. Passive Transport: (osmosis)
Cell transport
Passive Transport: (osmosis)
Water will move across the membrane until equilibrium is met
-Both solutions
are isotonic

17. Cell transport
Passive Transport: (osmosis)
If the conc. of water outside is greater than solutes-it is a hypotonic condition

18. There is net water movement into the cell.
Cell transport
Passive: (osmosis)
If the conc. of water outside is greater than solutes-it is a hypotonic condition
There is net water movement into the cell.

19. Cells without walls = swell & burst
Cell transport
Passive: (osmosis)
If the conc. of water outside is greater than solutes-it is a hypotonic condition
There is net water movement into the cell.
Cells without walls = swell & burst
Cells with walls = benefit from the turgor pressure

20. Cell transport
Passive: (osmosis)
If concentrations of dissolved solutes are greater outside the cell, the concentration of water outside is lower- Hypertonic

21. Cell transport
Passive: (osmosis)
If concentrations of dissolved solutes are greater outside the cell, the concentration of water outside is lower- Hypertonic
Water inside the cell will flow outwards to attain equilibrium = cell shrinks

22. Passive Transport: (osmosis)
Cell transport
Passive Transport: (osmosis)

23. Passive Transport: Osmosis examples: Cell transport
Drop of food coloring added to a cup of water
Wilted plant “perks” up after given water

24. Passive Transport: Facilitated Diffusion:
Cell transport
Passive Transport:
Facilitated Diffusion:
-Protein channels that make it easy for some large molecules (glucose) to fit through the membrane
-Still diffusion (no E)

25. Active Transport: Cell transport
movement from an area of low to high concentration
NEEDS ENERGY (ATP)

26. the opposite of diffusion
Cell transport
Active Transport:
the opposite of diffusion
proteins will help move molecules across the membrane using ATP

27. Cell transport
Active Transport:
Endocytosis : the movement of large particles into a cell by enclosing around it

28. Cell transport
Active Transport:

29. Cell transport
Active Transport:
Exocytosis: cell releases a particle by wrapping it in a vesicle then moves to the cell membrane

30. Transport through a membrane
sTrtsrsan
Transport
through a
membrane Ac Ac
PASSIVE
ACTIVE
NO ENERGY Ac Ac
ENERGY Ac Ac
endocytosis
LargeAc Ac
diffusion
osmosis
exocytosis