Membrane transport
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Membrane transport. Biology 1. Molecules move from high to low. Diffusion move from HIGH to LOW concentration. Diffusion. Move from HIGH to LOW concentration passive transport no energy needed. diffusion of water. diffusion. osmosis. Simple Diffusion (through the cracks) .

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Membrane transport

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Membrane transport

Membrane transport

Biology 1


Molecules move from high to low

Molecules move from high to low

  • Diffusion

    • move from HIGH to LOW concentration


Diffusion

Diffusion

  • Move from HIGH to LOW concentration

    • passive transport

    • no energy needed

diffusion of water

diffusion

osmosis


Simple diffusion through the cracks

Simple Diffusion (through the cracks)

  • Move from HIGH to LOW

fat

fat

fat

Which way will fat move?

inside cell

fat

fat

fat

LOW

HIGH

fat

outside cell

fat

fat

fat

fat

fat

fat

fat


Q what kind of molecules can move directly through bilayer by simple diffusion

Q: What kind of molecules can move directly through bilayer by simple diffusion?

  • Small gasses (O2, CO2)-through the cracks

  • Lipids (non-polar stuff)- same as membrane

  • Q2: What if you have a polar molecule? Like water?????


Facilitated diffusion bouncer

Facilitated Diffusion (bouncer)

  • Move from HIGH to LOWthrough a channel

sugar

sugar

sugar

sugar

inside cell

sugar

sugar

LOW

Which way will sugar move?

HIGH

outside cell

sugar

sugar

sugar

sugar

sugar

sugar

sugar


Simple vs facilitated diffusion

inside cell

inside cell

outside cell

outside cell

Simple vs. facilitated diffusion

simple diffusion

facilitated diffusion

lipid

H2O

protein channel

H2O


Q3 what polar molecules use facilitative diffusion

Q3: What polar molecules use facilitative diffusion?

  • Water (osmosis is facilitative diffusion through “Aquaporins”)

  • Glucose

  • Salts/ions (Cl-, K+, Na+, H+, Ca+)


Active transport the doorman

Active transport (the doorman)

  • Cells may need molecules to move against concentration “hill”

    • need to pump “uphill”

      • from LOW to HIGHusing energy

    • protein pump

    • requires energy

      • ATP

ATP


Transport summary

Transport summary

simplediffusion

facilitateddiffusion

ATP

activetransport


Bulk transport

Bulk transport

  • Moves LARGE GROUPS of molecules or chunks of food/waste in or out of a cell membrane.

  • Too big for proteins alone

  • Requires energy

  • 2 Types:

    • Endocytosis (move stuff up “en-der”)

    • Exocytosis (move stuff out, exit)


Endocytosis cellular feeding

Endocytosis- cellular feeding

  • You ingest food and water, cells do too!

  • Types ofENDOcytosis:

    • 1) Phagocytosis= “cellular eating”

    • 2) Pinocytosis= “cellular drinking”

  • Check out the video clips on endocytosis

  • http://www.youtube.com/watch?v=qpw2p1x9Cic

Omm Nom Nom


Exocytosis

Exocytosis

  • Materials exit the cell in bulk (signals, wastes)

    • Vesicle forms around materials inside cell

    • Fuses with membrane

    • Empties contents on the other side!


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