1. Cell transport notes Part 2 Get a textbook and turn to page

2. Active transport Movement of molecules across membranes that required energy (ATP) Goes against the concentration gradient. Moves from low to high concentration

3. Types of active transport • Endocytosis (into cell) and exocytosis (out of cell) • Pinocytosis – movement of liquid into and out of the cell. • Phagocytosis – movement of solute particles into and out of the cell. • Gated ion channels • Sodium/potassium pumps

4. Endocytosis and Exocytosis • Exocytosis • Vesicle form in the cell • Moves and attaches to the membrane • Releases materials outside of the cell. • Endocytosis • Membrane forms into vesicle. • Detaches from membrane • Pulls materials into the cell.

5. Gated ion channels Messenger attaches to receptor protein Reaction occurs which supplies energy to the gated protein. Channel opens to allow ions to enter.

6. Sodium/potassium pumps 3 Na+ ions bind Energy added in the form of ATP Ions moved out of cell 2 K+ ions attach and move into the cell. Process continues as needed.

8. Challenge Questions Question #1 Question #2 Explain why a salt water fish cannot survive in freshwater. Use the terms hypotonic, hypertonic and isotonic to explain. Explain how diffusion is involved with the transport of oxygen throughout your body. Must have a diagram to illustrate the process.