Card Set Information

2011-03-01 06:31:54
Cells Cycling Matter

Exchange of materials
Show Answers:

  1. What substances will easily pass through membranes?
    Tiny molecules and large oil soluble substances
  2. What does Impermeable mean?
    Can't pass through
  3. What are membranes impermeable to?
    • Most water soluble molecules
    • ions
    • Polar molecules
  4. What are membranes permeable to?
    • lipid-soluble substances
    • tiny molecules
    • Small uncharged molecules
    • Larger water soluble substances
  5. What is Diffusion?
    Diffusion is the net movement of molecules from a region of high concentration to a region of lower concentration.
  6. What type of process is Diffusion?
  7. What does diffusion need in order to go?
    concentration gradient
  8. What is being diffused?
    The solute is being diffused in the solvent
  9. What is Osmosis?
    • Osmosis is the passive net movement of water through a selectively permeable membrane, from an area of high concentration (an area where there are more free molecules) to an area of less concentration (less water molecules)
    • The water is diffusion along it's own conentration gradient.
  10. explain this image
    When a solute is added to water, the water molecules become attached. In a dilute solution though, there are more free water molecules than a concentrated one. When a semi permeable membrane separates a dilute and concentrated solution, the free water molecules will cross the membrane in both directions. However, since there are more free water molecules in the dilute solution, there will be a net movement of water molecules from the dilute solution to the concentrated.