Lecture4 - During facilitated diffusion a) substances are...

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During facilitated diffusion a) substances are moved uphill – from the side of the membrane with lower concentration to the side with higher. b) the binding site of the carrier has fixed affinity for the substance to be transported. c) ATP is used to flip the orientation of the carrier. d) ATP is used to change the affinity of the binding site.
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Lecture 4: Resting Potential Lecture 4: Resting Potential and Graded Potentials and Graded Potentials Reading: Ch 3, section: membrane potential, pgs 75-83 Ch 4, section: electrical signals, pgs 86-91
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Resting Membrane Potential - voltage difference across the plasma membrane, in millivolts , when the cell is at rest (i.e. no perturbing influences). Often abbreviated as Vm.
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Charge separation across a membrane Vm = 0 mV Vm does not equal 0
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Charge separation across a cellular membrane
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How does the cell create charge separation? 1. Establishes and maintains concentration gradients for key ions (Na + , K + , A - ). 2. Ions diffuse through the membrane down their concentration gradients. 3.
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Lecture4 - During facilitated diffusion a) substances are...

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