MATH 110 Final: Final Solutions Fall 2007
14 Mar 2019
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[na+: the potential difference across the barrier between endolymph and perilymph is due to the unequal concentration of na+ and k+ in those two fluids and the selective permeability of the two across the barrier between them. You record a potential difference is of 92 mv (endolymph positive) in mouse cochlea and you know the concentrations of the two ions (above). +90 = 61. 5 log [k]o + b [na]o/[k]i + b [na]i. 92/61. 5 = log 3 + b (150)/150 + b (1) The barrier is 37. 5 more permeable to na than to k: the time constant ( ) of an outer hair cell decreases when it is depolarized by a sound wave. There are two reasons such a thing happens. You strip away that myelin and find for the cell body is barely changed. And after all, the cell body is asked to propagate and action potential from its dendrite to its axon, not move current passively.
