Moving Cellular Materials

1. UNIT 3 – Lesson 5 Notes Moving Cellular Materials

2. Cell Membrane

3. Passive Transport • The movement of substances through the cell membrane without the input of energy. • Diffusion • Osmosis • Facilitated Diffusion NO ENERGY required!

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

5. 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.

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

7. Diffusion Demo Part 2: Does Heat Have an Effect On Diffusion?

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. Osmosis in Strawberries

11. Facilitated Diffusion • The diffusion of molecules across a membrane with the help of transport proteins. • Allows large moleculesto cross the membrane. Enter The Protein!

12. Facilitated Diffusion Outside of Cell Cytoplasm Cell Membrane Diffusion will continue until an equilibrium is reached! Transport Proteins

13. Facilitated Diffusion Draw Me! Before Diffusion Draw Me! After Diffusion Outside of Cell Cytoplasm Cell Membrane Diffusion will continue until an equilibrium is reached! Transport Proteins

14. Active Transport • An input of energy is required to move materials through a cell membrane. • A transport protein binds with the needed particle and cellular energy is used 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. That is why energy is required.

16. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

17. Draw Me! Before Transport Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

18. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

19. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

20. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

21. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

22. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

23. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

24. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

25. Active Transport Outside of Cell Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

26. Draw Me! After Transport Active Transport Outside of Cell Energy Wuz Here Energy Wuz Here Cytoplasm Cell Membrane Molecules move from low to high concentrations! Transport Proteins

28. 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.

29. 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

30. Endocytosis! Exocytosis!