How do things move in and out of cells?

1. How do things move in and out of cells?

2. GPS: S7L2 Students will describe the structure and function of cells, tissues, organs, and organ systems. • Explain that cells take in nutrients in order to grow and divide to make needed materials. • Relate cell structures (cell membrane, nucleus, cytoplasm, chloroplast, and mitochondria) to basic cell functions • Explain that cells are organized into tissues, tissues into organs, organs into systems, and systems into organisms GA Performance Standard

3. selectively permeable- some substances can pass through the membrane while others cannot • diffusion- the process by which molecules move from an area of higher concentration to an area of low concentration • osmosis- the diffusion of water molecules through a selectively permeable membrane • passive transport- the movement of dissolved materials through a cell membrane without using cellular energy • active transport- the movement of materials through a cell membrane using cellular energy • endocytosis- the process in which a cell membrane surrounds a particle and encloses it in a vesicle to bring it into the cell • exocytosis- the process used to remove large particles from a cell Vocabulary

4. selectively permeable- some substances can pass through the membrane while others cannot

5. diffusion- the process by which molecules move from an area of higher concentration to an area of low concentration

6. osmosis- the diffusion of water molecules through a selectively permeable membrane

7. passive transport- the movement of dissolved materials through a cell membrane without using cellular energy

8. active transport- the movement of materials through a cell membrane using cellular energy

9. endocytosis- the process in which a cell membrane surrounds a particle and encloses it in a vesicle to bring it into the cell

10. exocytosis- the process used to remove large particles from a cell

11. Diffusion

12. Diffusion is the process by which molecules move from an area of high concentration to low concentration. • Diffusion is the main method that molecules move across the cell membrane. • Diffusion is caused because molecules are always moving. • Molecules are bump into each other and cause them to spread. Diffusion

13. Osmosis

14. Osmosis is the diffusion of water molecules through a selectively permeable membrane. • Because cells cannot function properly without water, many cellular processes depend on osmosis. • Osmosis moves water molecules by the process of diffusion. • Osmosis keeps cells with their shape. Osmosis

15. Active and Passive Transport

16. Passive transport does NOT require using cellular energy to move material through a cellular membrane. • Active transport requires the cell to use its own energy while moving through the cellular membrane. • In active transport proteins get “picked up” outside the cell and carried inside the cell. • When cell remove large particle from inside the outside the cell this is called exocytosis. • Another method of active transport is engulfing. This is also known as endocytosis because it happens inside the cell. • During engulfing the cell membrane surrounds a particle and forms a vacuole within the cell. Active and Passive Transport

17. Engulfing or Endocytosis

18. Exocytosis