MATH 110 Final: Final Solutions Spring 2007
14 Mar 2019
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Current is flowing outward (+ values) which means the anion is flowing inward. = vm - ecl [and ecl is 58 x log [cl]o/[cl]i = 58 x log 20 = 58 x -1. 3 -75 mv: let us look at cl- conductance. Take a situation in which the external [cl-] is 120 mm while the internal [cl-] is 6 mm. Ecl = -70: a protein pump in the membrane keeps the internal [cl-] low in mature neurons it allows na to enter a neuron and uses the potential energy gained to pump cl- out of the cytoplasm. But neurons make that protein pump relatively late in their development and as a result the internal. [cl] in an immature neuron is 140 mm. The outward flux of cl- is depolarizing. (several of you told us that since the concentration of cl- on the two sides of the membrane was nearly equal, its df would be negligible.
