1. Ch. 7: The Structure & Function of Cells
Cell Membrane Processes: Controlling Water & Salts within the Cell

2. I) Cell Membrane Semi-permeable Maintains homeostasis
Only certain molecules can pass
Maintains homeostasis
1) Having a stable internal environment

4. II. Diffusion
The net movement of a liquid or gas from an area of high concentration to an area of lower concentration until equilibrium is reached throughout the liquid or gas.

6. III. Osmosis
The diffusion of water across a semi-permeable membrane, such as the cell membrane.

7. Higher concentration of water
Lower concentration of water
Equal concentration of water

10. IV. Cells in Solution

12. IV. Cells in Solution Hypertonic Solution:
Concentration of solutes greater outside of the cell then inside the cell.
Water will be pulled from the cell.

15. IV. Cells in Solution B) Hypotonic Solution:
Concentration of solutes greater inside of the cell then outside of the cell.
Water will be pushed into the cell.

18. IV. Cells in Solution C) Isotonic Solution:
1) Concentration of solutes equal both outside of cell and inside of the cell.
2) Water will enter and leave the cell at equal rates.

23. V. Facilitated Diffusion
A) Use of carrier proteins for diffusion to occur across the cell membrane.
B) Requires NO ENERGY input from the cell.
C) Used to transport large molecules, such as sugar.

24. Active Transport

25. VI. Active Transport
A) Using ENERGY to transfer molecules across the cell membrane.
B) Used to maintain ions (such as salts) in higher concentrations either inside or outside of the cell then would be possible via diffusion alone.

28. VII. Bulk Transport

29. VII. Bulk Transport
A) Large molecules are packaged in membrane-bound sacs (by the Golgi complex) and moved across the cell membrane.

30. VII. Bulk Transport
B) Endocytosis - moving bulk items into the cell.

31. VII. Bulk Transport Pinocytosis: moving small items
Phagocytosis: Moving large items

32. VII. Bulk Transport
C) Exocytosis - moving bulk items out of the cell.