Transport

  • Passive transport

    • atoms in things are moving in small movement, small vibrations but there is no addition kinetic energy

  • active transport

    • needs energy to form of ATP

  • Diffusion

    • net movement - high to low

    • dynamic equilibirum

      • movement equally in all directions, left, right; in, out

  • osmosis

    • osmolarity

      • looks at number of solute particples and the type of solute

  • water movement

    • the greatest water potential will be 0

    • distilled water had that water potential

    • but solute will always be negative

    • equation for h20 potential

    • Yw (overall h20 potential) = Ys (solute potential) + Yp(pressure potential)

  • types of facilities diffusion proteins

    • carrier binding of solute causes a conformational change in the carrier transports solute s

    • channel

      • solute interacts with R-gropus in channel - transport

      • types

        • Those operating 24/7

          • aquaporins

            • transports h2o h+ facilitates ADP ATP

        • gated channels (open/close)

          • electrochmiecal gradient

          • ligand gated channel

  • ON TEST

    • uniporter

      • carries one molecule or ion

    • symporter

      • two different molecules or ions but must be same direction

    • antiporter

      • two different molecuels or ions in two different directions at the same time

    • also on test

      • higher solute potential is the side with less solutes because it is closer to 0 and less negative than the side with more solutes

  • facilitated diffusion

  • Questions

    • What causes phosphorylation of the pump?

      • the na binding to the pump

    • what does phosphorylation of the pump do

      • cuase confomration

    • why do na ions move out of the pump

      • the pump changes to it has lower affinity for Na+

    • why do k+ ions bind to the pump

      • new shape has a high affinity for k+

    • what happens when the po4 moves off the pump

      • changes the shape back to the conformity

    • why does k+ move out fo the pump

      • it now has lower affinity for k+

    • what happens to the na+ binding sites after k+ moves into the cytosol

      • restors the higher affinity for the +

  • Is the Na+/k+ pump

    • Does not move Na+/k+ move two solutes at the same time

    • both solutes na+k+ move against their concnetration gradient

    • it uses ATP