ZOOL342 Lecture Notes - Lecture 3: Nernst Equation, Resting Potential, Membrane Potential

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plumtiger237

16 Jan 2019

School

University of Alberta

Department

Zoology (Biological Sciences)

Course

ZOOL342

Professor

Declan Ali

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Document Summary

Nernst equation: ek= is volts and convert into mv for cells, so 0. 025v to 25mv, convert ln to log: ek= 58 log (outside)/(inside) 2 and 3 equations are usually used in constant room temperature. Potassium is always less outside and high inside and cl- is high outside than inside. The positive and negative charges in and outside of the cell needs to balance out, Resting mv= -85mv: change [k+] double k+, so increase from 3 to 6, and take away 3 positive charges from na, to maintain electrical neutrality. Relative volume of one, potassium goes inside the cell and cl- follows k+ and goes inside the cell down its gradient. This causes the cell volume to increase and at the new equilibrium the membrane potential is -68mv. The volume increased so the effective concentration of na is smaller even though it was not allowed to move. little movement of cl- has great effect on the inside of the cell.

Related Questions

Which of the following is NOT a characteristic of cardiacmembrane depolarization / polarization leading to generation of theaction potential?

a. The presence of a large amount of negative charges inside thecell creates a negative resting potential

b. There is a large amount of potassium inside the cells and alot of sodium outside, creating a membrane potential, which causesopening of Na and K channels, beginning membrane depolarization

c. Along with Na, a large amount of Cl ions also enter thecells, further creating a negative membrane potential

d. In order to restore the resting potential, a Na/K ATPAseremoves 3 Na for every 2 K it takes in from the cytosol, leavingless positive charges inside the cell, returning to a negativepotential

ceriseshark886

Which of the following is NOT a characteristic of cardiacmembrane depolarization / polarization leading to generation of theaction potential?

a. The presence of a large amount of negative charges inside thecell creates a negative resting potential

b. There is a large amount of potassium inside the cells and alot of sodium outside, creating a membrane potential, which causesopening of Na and K channels, beginning membrane depolarization

c. Along with Na, a large amount of Cl ions also enter thecells, further creating a negative membrane potential

d. In order to restore the resting potential, a Na/K ATPAseremoves 3 Na for every 2 K it takes in from the cytosol, leavingless positive charges inside the cell, returning to a negativepotential

byzantiumhamster60

Which of the following is NOT a characteristic of cardiacmembrane depolarization / polarization leading to generation of theaction potential?
a. The presence of a large amount of negative charges inside thecell creates a negative resting potential
b. There is a large amount of potassium inside the cells and a lotof sodium outside, creating a membrane potential, which causesopening of Na and K channels, beginning membranedepolarization
c. Along with Na, a large amount of Cl ions also enter the cells,further creating a negative membrane potential
d. In order to restore the resting potential, a Na/K ATPAse removes3 Na for every 2 K it takes in from the cytosol, leaving lesspositive charges inside the cell, returning to a negativepotential

amaranthsnake714

ZOOL342 Lecture Notes - Lecture 3: Nernst Equation, Resting Potential, Membrane Potential

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