1. Diffusion (more practice) Blue = water molecule (solvent) Red = salt molecule (solute) What will move where? How many? Do they just stop moving? Distilled = pure = 0% conc. 10 9 4949 7979 7979

2. Diffusion across the cell membrane

3. Do they ALL just go in?

4. Diffusion across the cell membrane Dynamic Equilibrium = equal concentration on both sides, because moving back and forth equally

5. Diffusion across the cell membrane

6. Cell is Impermeable to Red Solute If cell lets water through, but not solute, then cell is… selectively (semi) permeable

7. Osmosis (more practice) Blue = water molecule (solvent) Green = metal molecule (solute) What will move where? How many? Do they just stop moving? Distilled = pure = 0% conc. 8 10 2 10 8 16 2424

8. Osmosis across the cell membrane Hypertonic Solution What would diffusion do?

9. Osmosis across the cell membrane Hypertonic Solution

10. Osmosis across the cell membrane Isotonic Solution

11. Osmosis across the cell membrane Hypotonic Solution What would diffusion do?

12. Osmosis across the cell membrane Hypotonic Solution

13. CHAPTER 5 Cellular Processes 5.9 Bulk Transport Pg. 80 Objective: I can name and describe different active transports in which the cell moves large amounts of materials into or out of the cell.

14. Major Cell Bulk Transport Moving LARGE amounts of material across the plasma membrane (in/out)  Active Transport - Requires energy  Some eukaryotes perform this ALL cells perform the following: Diffusion/Osmosis move only molecules at a time (slower/fewer)  Passive Transport - Not require energy Protein Pumps – move molecules (slow)  Active Transport - Requires energy

15. Bulk Passage Exocytosis  Exo- =  -cyto- =  -sis = Removing Waste or Export products Endocytosis  Endo- = Bringing in materials exit cell process enter move + form/dissolve vesicles, plasma membrane changing shape Prokaryotes Animal Cells Plant Cells

16. Endocytosis (2 main types) Phagocytosis  Phago- = eat  Bring in large particles Pinocytosis  Pino- = drink  Bring in liquids or dissolved particles http://www.maxanim.com/physiology/Endocytosis%20and%20Exocytosis/ee4.swf

17. Why does Bulk Passage require energy? Cell is changing shape (how?)  Plasma membrane bends inward (indent in)  Actin microfilaments dissolving/forming Vesicles moving around (how?)  Using protein motors  Riding the microtubules of cytoskeleton Basically, actions of cytoskeleton require energy

18. Receptor-Mediated Endocytosis Some areas of plasma membrane indented  These “pits” contain specific receptor proteins  Molecules fit receptor  trigger endocytosis Clathrin: A protein that coats indented area + vesicle (holds receptor protein in place) LDL: A type of cholesterol that is an example of something brought in by receptor- mediated endocytosis http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120068/bio02.swf::Endocytosis+and+Exocytosis