membrane potential
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | Action Potential (AP)
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| show | Resting Membrane Potential (RMP)
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| show | -90 mv
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| show | 142 mEq/L
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| show | 14 mEq/L
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| K+ (outside) | show 🗑
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| K+ (inside) | show 🗑
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| The flow of ions across the plasma membrane down their electrochemical gradients is directly responsible for generating much of the RMP | show 🗑
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| show | Membrane potentials
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| show | K
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| diffuses outside creating electronegativity inside while electropositivity outside the plasma membrane | show 🗑
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| Diffusion stops when _____________ is great enough to block further net diffusion to the exterior despite high K concentration inside | show 🗑
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| show | (-) 94 mV
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| show | Na ions
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| diffusion to the inside creates a membrane potential which is (+) inside and stops when diffusion potential = (+) 61 mV is reached | show 🗑
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| show | Nernst Potential
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| show | +/- 61 x log conc. inside divided by conc. outside
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| show | Nernst Potential
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| show | Na, K and Cl
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| The degree of importance of each of the ions in determining the voltage is proportional to the _________ for that particular ion | show 🗑
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| A (+) ion concentration gradient from the inside to the outside of the membrane causes __________ inside the membrane | show 🗑
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| __________ inside are left behind creating electronegativity inside plus Cl ions outside diffuse to the inside following Na ions | show 🗑
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| show | transmission of nerve impulse
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| ________does not change charges greatly | show 🗑
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| Rapid changes in Na and K permeability are primarily responsible for _______________ | show 🗑
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| continually transports Na to the outside and K ions to the inside of the cell | show 🗑
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| an electrogenic pump because more (+) charges are pumped to the outside than to the inside: 3Na + outside; 2K = outside | show 🗑
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| show | Effects Na- K Pump
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| show | Effects Na- K Pump
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| show | Effects Na- K Pump
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| show | Effects Na- K Pump
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| The _______________ is used to calculate the diffusion potential when the membrane is permeable to several different ions | show 🗑
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| show | 1) the polarity of the electrical charge of each ion
2) the permeability of the membrane (P) to each ion
3) the concentrations (C) of the respective ions on the inside (i) and outside (o) of the membrane
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| Gives the calculated membrane potential on the inside of the membrane when two univalent positive ions, K+ and Na+, and one univalent negative ion, Cl- are involved. | show 🗑
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| show | sodium, potassium, and chloride
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| The concentration of _______,__________,________ across the membrane helps determine the voltage of the membrane potential | show 🗑
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| the quantitive importance of _______,_____,_______ in determining the voltage is proportional to the ________________ for that particular ion. | show 🗑
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| If the membrane has _______ permeability of potassium and chloride ions, the membrane potential becomes entirely dominated by the concentration gradient of sodium ions alone, and the resulting potential will be equal to the _________for sodium | show 🗑
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| show | Origin of the Normal Resting Potential:
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| - Contribution of the Potassium Diffusion Potential | show 🗑
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| show | Origin of the Normal Resting Potential:
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Created by:
scarletsailboat