1. Outside of cell Inside of cell (cytoplasm) Lipid Bilayer Proteins Transport Protein Phospholipids Carbohydrate chains Structure of the Cell Membrane Go to Section: Animations of membrane structure

2. Cell Boundaries/ Cell Membrane Animal cellPlant cell Cell / Plasma Membrane Cell Wall – provides support & protection, usually made of tough fibers

3. Complex barrier separating the cell from it's external environment – Holding cytoplasm within cells – Regulating substances entering and exiting cells – Recognizing other cells – Provides protection and support Is arranged in a double layer called a Lipid Bilayer – Made up of Phospholipids (a phosphate group & 2 fatty acids) 1. The Cell Membrane

4. "Selectively Permeable" membrane that regulates (like a gate) what passes into and out of the cell

5. Cell Membranes are FLUID Lipids and Proteins of the Cell Membrane are always in motion 1. The Cell Membrane

6. Membrane Proteins – PROTEIN MOLECULES are EMBEDDED in the Lipid Bilayer – HELP to MOVE Material INTO and OUT of the Cell 1. The Cell Membrane

7. – Often have carbohydrates attached to them to serve as I.D. badges that allow cells to recognize each other 1. The Cell Membrane

8. Diffusion – Movement of particles from an area of high concentration to an area of low concentration (no energy required) (put dye in water) Osmosis – Diffusion of water through a selectively permeable membrane 1. The Cell Membrane

9. Facilitated Diffusion / Passive Transport – Uses proteins to move molecules through a cell membrane along the concentration gradient (no energy required) 1. The Cell Membrane

10. Active Transport – Uses proteins to move molecule against the concentration gradient – Requires energy 1. The Cell Membrane

11. Exocytosis and Endocytosis Exocytosis – process of a cell releasing materials (exiting) Endocytosis – process of cell taking materials in (entering) Exocytosis

12. Example of both: Nerurotransmitter

13. Isotonic – The concentration of solutes is the same inside and outside the cell – Water moves in and out Hypertonic – Solution has a higher solute concentration than the cell – Water moves out Hypotonic – Solution has a lower solute concentration than the cell – Water moves in

18. Youtube http://www.youtube.com/watch?v=HqKlLm2MjkI

19. Adiffusion Bfacilitated diffusion Cosmosis Dpassive transport Eactive transport Which cell process will move substances against a concentration gradient? [NC08 EOC] Requires ENERGY

20. Which diagram represents active transport? [TN09 EOC]