1. Aim: How does the structure of the cell membrane allow for its function? DO NOW: 1.Why do cells have a membrane? 2.Why does an apple have skin? 3.Think about a castle. What structure would be similar to a cell membrane?

2. Cell Membrane In both plant & animal cells Also called plasma membrane Barrier  separates the outside from the inside of a cell Selectively permeable: regulates transport of materials that come into or out of cell Made of lipids (fats), cholesterol & protein 2 layers: “phospholipid bi-layer” (sandwich) flexible Contains receptors for cell communication (ex. Hormones binding to cells)

3. Cell Membrane in Animal & Plant Cells

6. Cell Membrane Receptors

7. Transport Across Cell Membrane

8. Cell Membrane & Cell Homeostasis Since it is selectively permeable, cells can maintain stability or balance harmful substances may be kept out of cell Lets wastes leave cells

9. “Membrane, What can move across you, to enter or leave the cell?” Small sized molecules, such as digested food (nutrients) Oxygen Carbon dioxide Water

10. “Membrane, What can’t move across you to enter or leave the cell?” Large sized molecules, such as starch (complex carbohydrate) proteins Fats Digestion or breakdown into simple subunits or building blocks must take place first!!!

11. Video https://app.discoveryeducation.com/learn/video s/ADEE143F-3029-4292-83AC- A84B8ED4E906?hasLocalHost=false https://app.discoveryeducation.com/learn/video s/ADEE143F-3029-4292-83AC- A84B8ED4E906?hasLocalHost=false https://app.discoveryeducation.com/learn/video s/66FE3E26-DC36-4174-8C93- 969405E95E43?hasLocalHost=false https://app.discoveryeducation.com/learn/video s/66FE3E26-DC36-4174-8C93- 969405E95E43?hasLocalHost=false https://app.discoveryeducation.com/learn/video s/D331500E-2C3D-4327-918F- F07DE222F65E?hasLocalHost=false https://app.discoveryeducation.com/learn/video s/D331500E-2C3D-4327-918F- F07DE222F65E?hasLocalHost=false

12. Homework Read textbook pages 187-190 and answer questions 1, 2 & 3 on page 190. Write out questions and answers.