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17 Cards in this Set

  • Front
  • Back
Passive Transport
doesn't expend ceullular energy for the movemen to take place (like rolling down a hill)
3 types of passive transport
diffusion, osmosis and facilitated diffusion
transport of molecules (in general) from an area of high concentration to an area of lower concentration until equilibrium is reached.
what gets dissolved
what does the dissolving, more plentiful than solute
mixture of solutes and solvent
movement of H20 (water...dumbass) from high to low concentration through a membrane untili equilibrium is reached.
3 types of solutions (outside of cell)
Hypertonic, Hypotonic, isotonic
more solute, less solvent
less solute, more solvent
equal amounts of solute/solvent on both sides of membrane
Consequences of hypertonic
plasmolysis (cell shrinking)
-drinking out of ocean when thirsty
-placing fresh water in salt water (they'll die!)
Consequences of hypotonic
cytolysis (cell bursting)
-red blood cells in pure water
-salt water fish in fresh water
Osmotic pressure
osmosis can result in extra water molecules accumulating on one side of the membrane and pressuring the membrane.
Facilitated diffusion
protein channels in the cell membrane accept only certain particles, like a lock accepts a particular key
"two way" protein channels that transport molecules or ions through membrane in either direction. Like an open door that allows you to go in or out.
Different _____ particles fit different _____
diff. solute particles fit different pores, depending on size, polarity and shape of molecule