<ul><li>Objectives: </li></ul><ul><li>Explain the process of diffusion. </li></ul><ul><li>Describe how osmosis occurs. </l...
Exchange with the Environment <ul><li>The exchange of materials between a cell and its environment takes place at the  cel...
What is Diffusion? <ul><li>Remember that particles of a substance are always  moving  and  colliding  with each other. Par...
What is Diffusion? <ul><li>Diffusion   is the movement of these particles from area where their concentration is  high  to...
IMPORTANT FACT: <ul><li>Remember all organisms need  water  to  live . Their cells are surrounded by and filled with fluid...
<ul><li>Osmosis  is the diffusion of  water  through the  cell membrane </li></ul><ul><li>( selectively permeable ) </li><...
Moving Small Particles <ul><li>Many particles can diffuse directly through the cell membrane. Others larger particles must...
 
Passive vs. Active <ul><li>Passive Transport </li></ul><ul><li>The diffusion of particles through the  proteins . The part...
Moving Large Particles <ul><li>The cell membrane has two ways of moving large particles:  endocytosis  and  exocytosis . <...
<ul><li>Endocytosis </li></ul><ul><li>Means  inside  the cell </li></ul><ul><li>The cell membrane  surrounds  a particle a...
<ul><li>Exocytosis : </li></ul><ul><li>means  outside  the cell </li></ul><ul><li>When a large particle must be  removed  ...
 
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Exchange w environ pp (simple version)

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Exchange w environ pp (simple version)

  1. 1. <ul><li>Objectives: </li></ul><ul><li>Explain the process of diffusion. </li></ul><ul><li>Describe how osmosis occurs. </li></ul><ul><li>Compare active and passive transport. </li></ul><ul><li>Explain how large particles get into and out of cells. </li></ul>Exchange with the Environment
  2. 2. Exchange with the Environment <ul><li>The exchange of materials between a cell and its environment takes place at the cell’s membrane . </li></ul>
  3. 3. What is Diffusion? <ul><li>Remember that particles of a substance are always moving and colliding with each other. Particles naturally travel from areas where they are crowded to areas where they are less crowded . </li></ul>
  4. 4. What is Diffusion? <ul><li>Diffusion is the movement of these particles from area where their concentration is high to an area where their concentration is low . </li></ul><ul><li>This movement can occur across the cell membrane or outside of cells, and it does not require energy . </li></ul>
  5. 5. IMPORTANT FACT: <ul><li>Remember all organisms need water to live . Their cells are surrounded by and filled with fluids made mostly of water . </li></ul>
  6. 6. <ul><li>Osmosis is the diffusion of water through the cell membrane </li></ul><ul><li>( selectively permeable ) </li></ul>
  7. 7. Moving Small Particles <ul><li>Many particles can diffuse directly through the cell membrane. Others larger particles must travel through protein “doorways” in the cell membrane in order to enter or leave the cell. </li></ul><ul><li>Particles can travel through these proteins either by passive transport or by active transport . </li></ul>
  8. 9. Passive vs. Active <ul><li>Passive Transport </li></ul><ul><li>The diffusion of particles through the proteins . The particles move from an area of high concentration to an area of low concentration. </li></ul><ul><li>The cell does not need to use energy to make this happen. </li></ul><ul><li>Active Transport </li></ul><ul><li>The movement of particles through proteins against the normal direction of diffusion. The particles move from an area of low concentration to an area of high concentration. </li></ul><ul><li>The cell uses energy to make this happen. </li></ul>
  9. 10. Moving Large Particles <ul><li>The cell membrane has two ways of moving large particles: endocytosis and exocytosis . </li></ul>
  10. 11. <ul><li>Endocytosis </li></ul><ul><li>Means inside the cell </li></ul><ul><li>The cell membrane surrounds a particle and encloses it in a vesicle . </li></ul>
  11. 12. <ul><li>Exocytosis : </li></ul><ul><li>means outside the cell </li></ul><ul><li>When a large particle must be removed from the cell, the cell uses a different process. </li></ul><ul><li>Vesicles are formed at the ER or Golgi complex and carry the particles to the cell membrane . </li></ul>

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