- Dr.W is trying to explain the concepts of restingmembrane potential, equilibrium potential, and membrane potentialto the students in her laboratory. To do this, she uses a dish ofcultured motor neurons so that she can alter the solution coveringthe cells and she can use a recording electrode to pierce one ofthe cells and determine its membrane potential relative to theextracellular fluid. She asks you a number of questions before andafter she alters the conditions around the cell.
- Showing all work, calculate the EionforNa+, K+and Ca++
The normal media (fluid covering the cells) contains:
145 mEq/LNa+Â Â Â Â Â Â Â Â 5mEq/LK+Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â and2 mEq/L Ca++
and the intracellular fluid contains:
15 mEq/LNa+Â Â Â Â Â Â Â Â Â Â 155mEq/LK+Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â and0.0001 mEq/L Ca++
