1. Passive Transport

2. Homeostasis
“biological balance between a cell or organism and it’s external environment”
Maintained by the cell controlling what enters and exits (plasma cell membrane)

3. Good Stuff
a. CHO e. Water
b. Lipids f. Various Chemicals
c. Proteins
d. Nucleic Acid
Bad Stuff
a. Waste
b. Extra Water

4. Ways a cell maintain homeostasis
1. Diffusion
2. Osmosis
3. Facilitated Diffusion
4. Gated Channels
5. Active Transport
6. Endocytosis
7. Exocytosis

5. Diffusion
“movement of molecules from area of HIGH concentration to LOW concentration”
Concentration Gradient – difference in concentration

6. Equilibrium – point where the. concentration of a substance
Equilibrium – point where the concentration of a substance is equal throughout the solution

7. Types of Diffusion Facilitated Diffusion
“diffusion of molecules across the cell membrane with the help of a carrier protein”

8. Osmosis
Osmosis – the process by which WATER MOLECULES diffuse across a selectively permeable membrane

9. Direction of Osmosis
1. Hypotonic Solution
a. solute is less on the outside of cell compared to the inside
b. water is greater on the outside compared to the inside
CELL SWELLS

10. 2. Hypertonic Solution
a. solute is more on the outside than the inside
b. water is less on the outside than the inside
CELL SHRINKS

11. 3. Isotonic Solution
a. everything is equal
b. homeostasis

12. Examples Hypotonic Solution * Jellyfish in Lake Norman
→ Cell swells, fish dies

13. Hypertonic Solution
* freshwater plant in a salt water solution
→ Plant shrinks/shrivels and dies

14. Equilibrium/Homeostasis!!!
Isotonic Solution
* Jellyfish in the Atlantic Ocean
Equilibrium/Homeostasis!!!

15. Roles of Osmosis Kidneys use it to maintain water levels in the blood
Turgor Pressure
→ water pressure in plant cells
→ hypotonic environment

16. Plasmolysis
→ hypertonic environment
→ cell shrinks due to water leaving

17. Cytolysis
→ hyptonic environment
→ cell bursts due to water rushing into the cell