1. Homeostasis and Transport

2. Concentration The amount of solute in a solution.
Often measured as a percentage.
Deciding factor as to where particles move.

3. Passive Transport Movement of particles that does not require energy.
Diffusion
Osmosis
Facilitated Transport

4. Diffusion
When particles move from an area of high concentration to an area of low concentration.
Seeks to reach equilibrium
Equilibrium: when the concentration of solute is the same through out the system.
Even when equilibrium is reached, particles will continue to move (even exchange)

5. Diffusion, cont.

6. Osmosis
The diffusion of water through a selectively permeable membrane.
For example, sugar molecules can’t fit through the cell membrane, therefore, the water moves instead.

7. Osmosis
Ex: Same concentrations

8. Osmosis
Ex: salt water plant in freshwater

9. Osmosis
Ex: freshwater plant in saltwater

10. Facilitated Diffusion
Occurs when proteins in the cell membrane move molecules across the membrane.
Helps to “facilitate” or help the movement of sugar molecules.