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21 Cards in this Set
- Front
- Back
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bioelectric potential
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stored electrical energy with the capability of doing work
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What causes the bioelectri potential?
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unven charge distribution between the cytoplams and extracellular fluid
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What are the primary ions that exist in our cells?
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K
anionic porteins sodium choride |
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Which direction does the anionic proteins move?
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no where. it is high in the cytoplasm but the membrane is impermeable
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Which way does the gradient favor K to move?
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out
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Which way does the gradient favor Cl to move?
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in also Ca2+
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Which way does the gradient favor Na to move?
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in
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lipid bilayer makes up what % of the plasma membrane?
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50%
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membrane capacitance is largely due to...
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the lipid bilayer
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What is capacitance?
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ability of a body to hold a charge
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What is the major contribution to the membrane resistance?
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the integral, membrane-bound ion channels
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What is resistance?
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opposition to the electric current
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conductance
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ease of current flow
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ohm's law
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conductance is inversely proportional to resistance
V=I*R |
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What two factors affect the conductance and resistance?
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kinetic factors
steric factors |
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What is the electrical equivalent ciruit?
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capacitance in parallel with resistance
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What is the membrane capacitance value of most neurons?
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0.9 microF/cm^2
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you can't have current without...
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resistance...Wagner strongly emphasizes
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How does the voltage relate to capacitance?
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V=Q/C
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What is the magnitude of the voltage we are dealing with?
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megaohms to gigaohms
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The voltage will be ___ across each element.
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equal
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