Search 4:08 PM worksheet_membrane_potential.docx direction of movement can be tr

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Search 4:08 PM worksheet_membrane_potential.docx direction of movement can be tricky to predict when the two gradients oppose each other. gradients To figure out which gradient will "win" in a given situation, we have the Nernst equation. For a given ion, the Nernst equation tells us the membrane potential (that is, the electrical gradient) that perfectly counterbalances that ions chemical gradient, so This special membrane potential is called that ions equilibrium potential (abbreviated E for equilibrium) or Nernst potential. The Nernst equation can be written in several forms, depending on one's assumptions. Figure 2 shows a "full" version and a simplified version, along with (of course!) the lyrics for a Nernst equation jingle. Note the logarithm in the equation. A logarithm is another word for exponent. For example, 1000 may be written as 10', so log,( 1000) is 3 6. If the ratoellula [ionaceldlar is less than 1, the logo of this ratio will be concentrated inside the cell than outside (e.g., K will have an equilibrium potential (E) that is- Therefore, any cation that is more The Nernst Equation SONG LYRICS EQUATION Find the concentrations of ions out and in Figure out the quotient, and take the log (base 10). Multiply by a "constant like 58 mV Divide by ion valence, 2, to find potential E Example potassium(K |58-r .logi.()-4 No net flow goes in or out (forces are balanced For whichever individual ion we've talking about Two driving forces cancel out (cancel out, baby) Perfect opposition of the gradients closes the spout :Nerest equation and song hrics From Open With Print

Explanation / Answer

6) If the ratio of (ion) extracellular / (ion) intracellular is less than 1, the log 10 value of this ratio would be less than zero. Therefore, any cations that is more concentrated inside the cell than outside, it will have an equilibrium potential that is negative. Eg. potassium ions.

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