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15 Cards in this Set
- Front
- Back
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What is the definition of activity in relation to ions? |
The effective concentration of an ion in solution
(pg 73) |
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All the ion fluxes that underlie signaling are due to ions moving passively thourgh open channels along ______ and _______ gradients. |
concentration; potentional (pg 75) |
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The electrical potential that reduces the net flux of an ion to exactly zero is called the __________ for that ion. |
equilibrium potential (pg 75, summary box) |
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The Nernst equation is calculated using the ________ scale. |
logarithmic (pg 73) |
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When attempting to isolate the H1 cell, what sense (sight, sound, touch, taste) must you use first before you look at the EEG? |
hearing (video 2 1:14) |
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What stimulus is used to cause a reaction of the H1 neuron? |
Horizontal movement (video 1 1:14) |
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What are the experimenters trying to minimize on the EEG reading? |
Interference from other neurons (video 2 3:01) |
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What is a voltage-sensitive potassium channel that allows potassium to flow into the cell only when the membrane potential is negative to the potassium equilibrium potential? |
inward rectifier channel
(pg 74)
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Should the Nernst equation be written with an activity ratio or a concentration ratio? |
activity ratio (pg 73) |
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The constant K is given by the equation RT/zF where z is what? |
the valence of the ion (pg 73) |
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What is the effective concentration of an ion in solution called? |
its activity (pg 73) |
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For most channels, diffusion does not provide an adequate description of the permeation process. Why is this? |
Because the channels themselves interact with the ions (pg 74) |
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What does the Nernst Equation for potassium measure? |
How large a potential is required to balance a potassium concentration difference across the membrane of a cell (pg 73) |
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Neurons use electrochemical gradients to generate ion movements which in turn create what? |
Electrical signals (pg 75) |
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To maintain ionic composition of cytoplasm a cell must use what? |
metabolic energy (pg 75) |
