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Cell Membrane Transport Part 1: Passive Diffusion
Introduction: The Cell Membrane <ul><li>“ Fluid Mosaic” </li></ul><ul><ul><li>Flexible/movable; </li></ul></ul><ul><ul><li...
Structure of the Cell Membrane
Diffusion <ul><li>Molecules move from area of  HIGH to LOW  concentration until equilibrium is reached </li></ul>
Diffusion
Solutions <ul><li>Solute:  the dissolved substance in a solution </li></ul><ul><li>Solvent:  the liquid that dissolves oth...
Types of Solutions <ul><li>Hyper tonic:  HIGH solute concentration </li></ul><ul><li>Hypo tonic:  LOW solute concentration...
Passive Diffusion <ul><li>When substances move across the cell membrane from an area of  higher concentration to lower con...
Diffusion through a membrane SOLUTE moves DOWN concentration gradient  (HIGH concentration to LOW concentration) Cell memb...
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Passive Diffusion

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Passive Diffusion

  1. 1. Cell Membrane Transport Part 1: Passive Diffusion
  2. 2. Introduction: The Cell Membrane <ul><li>“ Fluid Mosaic” </li></ul><ul><ul><li>Flexible/movable; </li></ul></ul><ul><ul><li>Mix of phospholipids and proteins </li></ul></ul><ul><li>Selectively permeable (semipermeable) </li></ul><ul><ul><li>Controls what enters/exits </li></ul></ul><ul><ul><li>Protects internal environment </li></ul></ul><ul><li>Allows for communication between cells </li></ul>
  3. 3. Structure of the Cell Membrane
  4. 4. Diffusion <ul><li>Molecules move from area of HIGH to LOW concentration until equilibrium is reached </li></ul>
  5. 5. Diffusion
  6. 6. Solutions <ul><li>Solute: the dissolved substance in a solution </li></ul><ul><li>Solvent: the liquid that dissolves other substances </li></ul><ul><li>Solute + Solvent = Solution </li></ul>
  7. 7. Types of Solutions <ul><li>Hyper tonic: HIGH solute concentration </li></ul><ul><li>Hypo tonic: LOW solute concentration </li></ul><ul><li>Iso tonic: Equal concentration of solute between areas (equilibrium) </li></ul>
  8. 8. Passive Diffusion <ul><li>When substances move across the cell membrane from an area of higher concentration to lower concentration </li></ul><ul><li>No energy needed to move molecules across membrane ( “Automatic” diffusion) </li></ul><ul><li>Ex. Oxygen and CO 2 </li></ul>
  9. 9. Diffusion through a membrane SOLUTE moves DOWN concentration gradient (HIGH concentration to LOW concentration) Cell membrane
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