Cell%20Transport

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Cell Transport

• Cell Bio. Genetics
• Mr. Foster

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Cell Transport

• Passive energy not required to move material
  across membrane
• Diffusion molecules move from high to low
  concentration to reach equilibrium
• http//www.indiana.edu/phys215/lecture/lecnotes/l
  ecgraphics/diffusion.gif

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Cell Transport

• Passive Transport (cont)-
• Osmosis type of diffusion involving H2O
  molecules only
• VIDEO LINK- http//programs.northlandcollege.edu/b
  iology/Biology1111/animations/transport1.html

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Cell Transport (cont.)

• Active Energy required to move materials across
  membrane
• Low to High concentration
• Ion pumps/Channels- Cl-, Na, K, Ca
• Endocytosis / Exocytosis membrane forms pockets
  to move material

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Endocytosis / Exocytosis
Clicker ?s 17-20
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Hypertonic

• A hypertonic solution contains a greater
  concentration of impermeable solutes than the
  solution on the other side of the membrane.

7
H20 in or out
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Hypertonic

• If a cell is placed in a hypertonic solution,
  there will be a net movement of water out of the
  cell until the concentration of impermeable
  solutes in the cell equals that of the hypertonic
  solution.

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Hypotonic

• A hypotonic solution contains a smaller
  concentration of impermeable solutes than the
  solution on the other side of the membrane

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H20 in or out
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Hypotonic

• If a cell is placed in a hypotonic solution,
  there will be a net movement of water into the
  cell until the concentration of impermeable
  solutes in the cell equals that of the hypotonic
  solution.

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Isotonic

• An isotonic solution contains an equal
  concentration of impermeable solutes as the
  solution on the other side of the membrane.

13
H20 in or out
14
Isotonic

• If a cell is placed in an isotonic solution,
  there will be no net movement of water in or out
  of the cell because the concentration of
  impermeable solutes in the cell equals that of
  the external environment.

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