Homework 1 A rather tame ltxnsp was recently found on Easter Island by a retired

Question

Homework 1 A rather tame ltxnsp was recently found on Easter Island by a retired neurophysiologist. He reported the following measurements of ECF and ICF concentrations (in millimoles): ICF ECF Pr+ 0 150 Na+ ? ? K+ 10 100 Cl- 109 250 HCO3- 1 10 a) He lacked the proper instruments for determining Na+ concentrations, but was rather certain that no other major ions were present in the ECF and ICF. Can you calculate either concentration for him? (Show all calculations) b) He measured Em (membrane potential) as -58 mv at 20

Explanation / Answer

we use the Nernst eqn in this case to figure it out which is

Em= 58/ z * log (xo/xi)

Na and Cl is transported via the symporter so only charges are opposite. therefore we find the Em of Cl-

after that we find what's K

find Na

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