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

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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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This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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

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