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Part 1

Part 1. Cell Membrane and Transport. What is an Isotonic Solution? . [Water] inside cell = [Water] outside cell Cell is at equilibrium Molecules are equally distributed in end The amount of water entering the cell = the amount of water leaving the cell. 95% water. 95% water.

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Part 1

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  1. Part 1

  2. Cell Membrane and Transport

  3. What is an Isotonic Solution? • [Water] inside cell = [Water] outside cell • Cell is at equilibrium • Molecules are equally distributed in end • The amount of water entering the cell = the amount of water leaving the cell 95% water 95% water

  4. What is a hypotonic solution? • A solution that has MORE water, and LESS solute • The cell can lyse or burst if left in a hypotonic solution 100% water 95% water

  5. What is a hypertonic solution? • A solution that has LESS water and MORE solute • The cell will dehydrate 90% water 95% water

  6. Which direction does water flow? • Water doesn’t flow at all. • Water flows from an area of low concentration to an area of high concentration. • Water flows from an area of high concentration to an area of low concentration.

  7. The Cell Membrane and Diffusion The plasma/cell membrane is selectivelypermeable ~only certain substances are allowed to pass through

  8. CAN PASS THROUGH Things that can dissolve in fat Small molecules Water CAN NOT PASS THROUGH Things that can dissolve in water Large molecules Ions: Molecules with plus (+) or minus (-) charges CH2OH OH What can and can not pass through the membrane?

  9. Part 2

  10. Passive Transport There are three types… 3 types No energy is used [High]  [Low] (it’s the natural flow) This means it goes down a concentration gradient

  11. 3 types of Passive Transport 1. Diffusion 2. Osmosis 3. Facilitated Diffusion

  12. [High] [Low] Diffusion

  13. Osmosis

  14. CH2OH OH + Facilitated Diffusion Passive Transport: Facilitated Diffusion

  15. Active Transport There are three types… 3 types Energy is used [Low]  [High] This means it goes up or against a concentration gradient

  16. 3 Examples of Active Transport 1. Protein pumps 2. Endocytosis 3. Exocytosis

  17. Protein Pumps Protein Pumps:proteins use energy to pull or pump materials into or out of the cell to stockpile or store substances the cell needs

  18. Different Types of Membrane Proteins (page 77) SIGNAL/ RECOGNITION TRANSPORTERS RECEPTORS ENZYMES

  19. Different Types of Membrane Proteins (page 77) signal/recognition Enzymes receptor transporter

  20. When cells engulf particles into the cell 2 types Phagocytosis: When a cell wraps part of its membrane arounda large particle forming a “pocket” or vesicle Pinocytosis: The same process, but with smaller particles or liquids Endocytosis

  21. A vesicle carrying a substance fuses with the cell membrane and releases the substance Exocytosis

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