BIOL 4160 Lecture : Day 1 Notes

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azuremammoth471

15 Mar 2019

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Law of electro neutrality : it"s a bad law. Highest concentration of a cell: calcium outside of cell. Proteins that act as pumps, there are multiple chloride pumps. The majority of cl- is outside because it the anion to the na+. Negative charge inside cell is called resting membrane potential (voltage) Potassium leaving the cell through pore is diffusion ( a random movement of ions). There is an electrical gradient being put up and the inside of the cell is becoming more negative. So the gradient puts some more k+ back in, to get closer to equilibrium. The cell will only meet equilibrium if that"s the only ion moving. Lets say the cell is no longer permeable for k+, but there"s some channels open that is permeable to. A real cell has leakage channels for k+ and na+ , but k+ is much more permeable through the membrane than na+.

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 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

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

BIOL 4160 Lecture : Day 1 Notes

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