transport across cell membranes Flashcards

1
Q

passive transport 4

A
  • in motion
  • random movement
  • constantly bouncing around
  • net movement of molc or ions from a region of high conc to a reigon of low or equally distributed conc.
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2
Q

facilitated diffusion 5

A
  • charged ions and polor molc
  • transmembrane channels
  • passive
  • down a conc grad
  • uses protein channels and carrier proteins
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3
Q

protein channels 5

A
  • water filled (hydrophilic channels)
  • specific water soluble ions
  • ions not present=closed=controlled
  • ions bind=change in shape
  • closed on one side and open on the other
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4
Q

carrier proteins 3

A

particles are taken up by carrier proteins = change in shape=release to other side

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5
Q

osmosis 4

A
  • passage of water from a high water potential to a low water potential through a selectively permeable membrane
  • substance dissolved in solvent=solute
  • solvent+solute=solution
  • measured in kpa
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6
Q

active transport 3

A
  • movement from low to high using ATP and carrier proteins
  • directly moves molc using ATP
  • moves molc using a conc grad ->co transport
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7
Q

how is active transport different to passive

A
  • uses ATP
  • against conc grad
  • proteins (carrier) pumps
  • selective
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8
Q

Active transport of a single molc/ion

A
  • molc bind to protein receptor site
  • ATP binds to protein = ADP=change in protein =released
  • protein releases phosphate =reverts shape in ADP->ATP during respiration
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