2. { Aim: How does the plasma membrane help to maintain a cells’ homeostasis? Do now: why do buildings use gates? How does the plasma membrane help to maintain homeostasis?

3. Gates… Keep unwanted people Let in wanted people They help us be selective on who can enter. How does the plasma membrane help to maintain homeostasis?

4. Gates… Keep unwanted people Let in wanted people They help us be selective on who can enter. The Plasma Membrane works like a gate to the cell, it keeps unneeded substances out and allows needed substances in. How does the plasma membrane help to maintain homeostasis?

5. What is the role of the plasma membrane? Activity- Close Reading How does the plasma membrane help to maintain homeostasis?

6. The Plasma Membrane And Homeostasis How does the plasma membrane help to maintain homeostasis?

7. Homeostasis – Maintaining a Balance Cells must keep the proper concentration of nutrients and water and eliminate wastes. How does the plasma membrane help to maintain homeostasis?

8. Is selectively permeable(picks and chooses) – it will allow some things to pass through, while blocking other things. Plasma Membrane (Cell membrane) How does the plasma membrane help to maintain homeostasis?

9. Selectively Permeable How does the plasma membrane help to maintain homeostasis?

10. Structure of the Plasma Membrane How does the plasma membrane help to maintain homeostasis?

11. The plasma membrane is composed of a phospholipid bilayer (2 layers of phospholipids) How does the plasma membrane help to maintain homeostasis?

12. In your notebook draw the following picture of the plasma membrane. How does the plasma membrane help to maintain homeostasis?

13. Transport Proteins the channel for nutrients, water & waste to get into and out of the cell. How does the plasma membrane help to maintain homeostasis?

14.  No everything can get into the cell  The Plasma membrane lets in small molecules (water, sugar)  The Plasma membrane keeps out larger molecules (starch) The Plasma Membrane Discriminates… How does the plasma membrane help to maintain homeostasis?

17. Plasma Membrane Visual http://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535: :535::/sites/dl/free/0072437316/120068/bio04. swf::Cotransport How does the plasma membrane help to maintain homeostasis?

19. Diffusion The movement of substances across the plasma membrane without the use of energy. How does the plasma membrane help to maintain homeostasis?

20. { Tomorrow we will learn more about Diffusion How does the plasma membrane help to maintain homeostasis?

21. Reading- Answer Questions Homework How does the plasma membrane help to maintain homeostasis?

22. Assessment