The document discusses osmosis and cell transport mechanisms. It defines osmosis as the movement of water across a membrane from an area of higher water concentration to lower. The document outlines different transport mechanisms including simple diffusion, facilitated diffusion, endocytosis, exocytosis, and active transport. Active transport requires energy from the cell to move particles from low to high concentration against the gradient.

1. Launch Which way will the water go? The solution of the environment around the cell is ___________ compared to the solution inside of the cell. HYPOTONIC 65% H 20 35% solute 80% H20 20% solute

2. We look at the concentrations of water (solvent) to determine water flow. H20 flows from high to low We look at the solute concentration to determine hypotonic, hypertonic, and isotonic Hypertonic means your solute concentration is higher than another Hypo tonic means your solute concentration is lower than another Isotonic means your solute concentration is the same as another

3. Quiz Tomorrow Cell Membrane Structure Phospholipids Osmosis Passive and Active Transport

4. Quiz Averages B1- 8 80% B2- 8.2 82% B3- 9 90% B5- 9.2 92%

5. Objective I will understand the ways that different things cross the cell membrane to get IN and OUT of the cell.

6. Osmosis Review What is osmosis? Write down a simple description in your own words in your notes. Hint: what is moving? where is it moving? what about the concentration is important? 95% Water 5% Water Water Membrane

7. Simple Diffusion Movement across the membrane from HIGH to LOW concentrations

8. Facilitated Diffusion facilitate = help along. diffusion that needs a little help Three ways with the cell membrane: Protein Carriers Endocytosis Exocytosis

9. Protein Carriers Proteins that help move medium sized molecules from high concentration to low concentration across the cell membrane Tunnels living in the membrane that help move things through

10. Endocytosis/Exocytosis Large molecules (like sugars) ENTER/EXIT the cell by creating a little membrane pocket around the molecule and absorbing that pocket (vesicle)

11. Endocytosis and Exocytosis http://www.youtube.com/watch?v=s0p1ztrbXPY&feature=related http://www.youtube.com/watch?v=HndmASfmI8Y

12. Passive Transport Movement across the membrane that is easily done without energy OSMOSIS, SIMPLE AND FACILITATED DIFFUSION Passive = pass right on through

13. Active Transport The ability of a cell to move particles from region of LOW to HIGH This requires energy from the cell This is called ACTIVE Transport = movement across the membrane that is easily done but with energy (ATP) http://www.youtube.com/watch?v=STzOiRqzzL4