Moving Cellular Materials

1. UNIT 3 – Lesson 5 Notes Moving Cellular Materials

2. Cell Membrane

3. WASTE What a Cell Wants: OXYGEN WATER FOOD What a Cell Does NOT Want:

4. Passive Transport • The movement of substances through the cell membrane without energy. • Diffusion (gas) • Osmosis (water) • Facilitated Diffusion (food) NO ENERGY required!

5. Diffusion • The random movement of molecules from a high concentration to a low concentration. (GASES) • But what does having a high concentration mean? • CLASS DEMO

6. Diffusion • Molecules of a substance will continue to move until the relative number of these molecules is equal in both areas. • This is called equilibrium. Example: Oxygen from lungs diffuses into blood.

7. Draw Me! After Diffusion Draw Me! Before Diffusion Simple Demo

8. Osmosis • The diffusion of water molecules into or out of the cell. • Water moves from an area of higher water molecule concentration to an area of lower water molecule concentration. Humm…sounds just like diffusion – except it’s with water!

9. Osmosis Cell Exposed to Pure Water Normal Cell Cell Exposed to Salt This movement will occur across a membrane. “Salt Sucks” – salt sucks water out of things.

10. Simple Demo

11. Osmosis in Strawberries

12. Facilitated Diffusion • The diffusion of molecules across a membrane with the help of transport proteins. • Allows large molecules (food)to cross the membrane. Enter The Protein!

13. Draw Me! After Diffusion Draw Me! Before Diffusion Simple Demo proteins

14. Active Transport • ENERGY is required to move materials through a cell membrane. • A transport protein binds with the needed particle to move it through the cell membrane.

15. Active Transport • Molecules are moved against a concentration gradient. They move from areas of low concentration to areas of highconcentration. • Moves Waste With ENERGY

16. Draw Me! After Transposrt Draw Me! Before Transport Simple Demo proteins Uses ENERGY

17. https://www.youtube.com/watch?v=STzOiRqzzL4

18. Endocytosis • The process of taking substances into a cell by surrounding it with the cell membrane. • The cell membrane folds in on itself, enclosing the item in a sphere called a vesicle. The sphere pinches off, and the resulting vesicle enters the cytoplasm.

19. Exocytosis • The process of getting rid of substances. • The membrane of the vesicle fuses with the cell’s membrane and the contents are released. Outside of Cell Inside of Cell

20. Endocytosis! Exocytosis!

21. https://www.youtube.com/watch?v=DuDmvlbpjHQ