Cellular Transport     Chapter 8
Figure 8.6 The detailed structure of an animal cell’s plasma               membrane, in cross section
Figure 8.4 The fluidity of membranes
Figure 8.9 Some functions of membrane proteins
Cells move substances through the cell membrane by   a process called transport• Two Types of Transport:  – Passive Transp...
What is Diffusion or    Passive Transport?• Requires no energy from cell.• Molecules move from  high concentration to  low...
Figure 8.10 The diffusion of solutes across membranes
How would diffusion happen in a cell?
Osmosis is a type of    diffusion     Cell Membrane
Figure 8.11 Osmosis
HELP WANTED!                I’m aFacilitated Diffusion             Channel, I                                  can help!  ...
Figure 8.14 Two models for facilitated diffusion
Water balance of cells      without walls:    80% H2O                          80% H2O                    80% H2O100% Dist...
Which way did the          water move?    80% H2O100% Distilled       Why did the cell   Water              get so big?
Which way did the      water move?   80% H2O  80% Water      Why did the cell20% Dissolved     stay the same Substances   ...
Which way did the      water move?    80% H2O  70% Water     Why did the cell get30% Dissolved       so small? Substances
Figure 8.12 The water balance of living cells
Figure 8.13 The contractile vacuole of Paramecium: an     evolutionary adaptation for osmoregulation
Figure 8.15 The sodium-potassium pump: a specific case                   of active transport
Figure 8.17 An electrogenic pump
Figure 8.18 Cotransport
How is Active      Transport different?1. Active transport requires energy.2. Molecules move from low   concentration to h...
Figure 8.16 Review: passive and active transport                  compared
Endocytosis• Cells bring large in particles using  cell membrane  – There are 2 types:     • Phagocytosis    • Pinocytosis
Phagocytosis                                       Amoeba• This is the ingestion of large particles.• Your white bloods ce...
Pinocytosis• Tiny pockets form along cell membrane, and  pinch off into vacuoles inside the cell.  Sometimes called “Cell ...
Figure 8.19 The three types of endocytosis in animal cells
Exocytosis• This is how the cell gets rid of waste.
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Ch.8 cell transport - notes version

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  • This is going to show how cells transport substances in and out.
  • Ask the kids what the word transport means. (To move from one place to another). Cells need to move substances in and out in order to function.
  • These are the three characteristics of passive transport. Concentration gradient – molecules flow with the movement of molecules. “Goes with the flow” – the different concentrations within a space.
  • Tell the kids to watch the molecules moving across the membrane. Ask why they are moving. – to reach equilibrium. Notice that some molecules are disappearing (they are being used.)
  • Ask what the “Mickey Mouse” molecules represent. - water (They should know this from previous powerpoints). Have the students explain to what is happening. Include movement from high to low.
  • Facilitated Diffusion – channel proteins allows substances into the cell. Remember, the cell does not use energy during passive transport.
  • Ask the students to predict what would happen to the cells in the beaker. You may want to explain solutions first. Dissolved substances would be sugars, salts, ions, etc.
  • Have the students predict – and then show the answer. You have to click to get the beaker and the question to show.
  • Predict and show answer.
  • Predict and show answer.
  • Ask the students what the energy is - ATP
  • Endocytosis is the process of brining particles into the cell. To demonstrate with the use of channels proteins, click on the link at the bottom of the page. You must close the browser window to return to the powerpoint.
  • Make sure to point out that the diagram is an amoeba, not a human cell. As the “food particle” moves in the cell, it fuses with lysosomes to be digested.
  • For animation, point out to the students that the cell doesn’t “spit” the contents out, like it does in the picture. The particles move into the cell and become part of a vacuole.
  • The blue particle should have “waste” particles in it, but does not. Make sure this is pointed out to the students. The waste fuses to the cell membrane and is then released into the environment.
  • Ch.8 cell transport - notes version

    1. 1. Cellular Transport Chapter 8
    2. 2. Figure 8.6 The detailed structure of an animal cell’s plasma membrane, in cross section
    3. 3. Figure 8.4 The fluidity of membranes
    4. 4. Figure 8.9 Some functions of membrane proteins
    5. 5. Cells move substances through the cell membrane by a process called transport• Two Types of Transport: – Passive Transport – Active Transport
    6. 6. What is Diffusion or Passive Transport?• Requires no energy from cell.• Molecules move from high concentration to low concentration.• Molecules move with the concentration gradient.
    7. 7. Figure 8.10 The diffusion of solutes across membranes
    8. 8. How would diffusion happen in a cell?
    9. 9. Osmosis is a type of diffusion Cell Membrane
    10. 10. Figure 8.11 Osmosis
    11. 11. HELP WANTED! I’m aFacilitated Diffusion Channel, I can help! tranport proteins help substances (glucose) pass through the cell membrane. Still passive transport - no energy required.
    12. 12. Figure 8.14 Two models for facilitated diffusion
    13. 13. Water balance of cells without walls: 80% H2O 80% H2O 80% H2O100% Distilled 70% Water Water 30% Dissolved 80% Water Substances 20% Dissolved Substances
    14. 14. Which way did the water move? 80% H2O100% Distilled Why did the cell Water get so big?
    15. 15. Which way did the water move? 80% H2O 80% Water Why did the cell20% Dissolved stay the same Substances size?
    16. 16. Which way did the water move? 80% H2O 70% Water Why did the cell get30% Dissolved so small? Substances
    17. 17. Figure 8.12 The water balance of living cells
    18. 18. Figure 8.13 The contractile vacuole of Paramecium: an evolutionary adaptation for osmoregulation
    19. 19. Figure 8.15 The sodium-potassium pump: a specific case of active transport
    20. 20. Figure 8.17 An electrogenic pump
    21. 21. Figure 8.18 Cotransport
    22. 22. How is Active Transport different?1. Active transport requires energy.2. Molecules move from low concentration to high concentration3. Molecules move against concentration gradient.
    23. 23. Figure 8.16 Review: passive and active transport compared
    24. 24. Endocytosis• Cells bring large in particles using cell membrane – There are 2 types: • Phagocytosis • Pinocytosis
    25. 25. Phagocytosis Amoeba• This is the ingestion of large particles.• Your white bloods cells also do this.
    26. 26. Pinocytosis• Tiny pockets form along cell membrane, and pinch off into vacuoles inside the cell. Sometimes called “Cell Drinking”
    27. 27. Figure 8.19 The three types of endocytosis in animal cells
    28. 28. Exocytosis• This is how the cell gets rid of waste.

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