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trnspt - pipe ❚ Through pores in membranes ❚ Through...

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TRANSPORT ACROSS MEMBRANES THE WAY CELLS REGULATE THEIR CONTENTS
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TWO MAJOR TYPES OF TRANSPORT PASSIVE: Only from high concentration to  low ACTIVE: Can actually pump up a gradient  using energy from some other source  such as ATP (Primary) or another gradient  (Secondary)
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Passive Transport Diffusion Bulk Flow Electrodiffusion Current Flow Osmosis Facilitated Diffusion
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Diffusion Diffusion occurs when  concentration in one  region is greater than  in another The end result is an  even distribution  called equilibrium Before: After:
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Diffusion across a permeable membrane Diffusion occurs when  concentration in one  region is greater than  in another The end result is an  even distribution  called equilibrium Before: After:
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Impermeable membrane Diffusion can not  occur Before: After:
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Bulk Flow Analogous to the flow of water through a 
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Unformatted text preview: pipe ❚ Through pores in membranes ❚ Through blood vessels ❚ Through other tubular structures Current Flow +-POSITIVE REGION NEGATIVE REGION CATIONS AND ANIONS MOVE IN OPPOSITE DIRECTIONS CARRYING ELECTRICAL CURRENT CURRENT = FLOW OF CATIONS - FLOW OF ANIONS Osmosis ❚ SOLUTE NO SOLUTE SOLUTE NO SOLUTE Before: After: Water moves across a semi-permeable membrane to the side where the solute is most concentrated Facilitated Diffusion ❚ 1. Molecule binds to carrier ❚ 2. Carrier changes conformation ❚ 3. Molecule released on other side ❚ 4. Purely passive process- stops when concentrations are equal ACTIVE TRANSPORT REQUIRES AN INPUT OF ENERGY ❚ USUALLY IN THE FORM OF ATP ❚ ATPase IS INVOLVED ❚ SOME ASYMMETRY IS NECESSARY ❚ CAN PUMP UPHILL ACTIVE TRANSPORT ADP ATP...
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