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Subjects/Physiology/Physiology
Physiology
medium
heart-pulse Physiology

The concentration of a negative ion is 100 mMoUL extracellular and 10 mMo1/1 intracellular. What will be the Nernst potential for this ion?

A. --10 mV
B. +10 mV
C. --61 mV
D. +61 mV

Explanation

Ans: C. --61 mVRef: Ganong 25Ie p9, p24Ie p9-10; Guyton 13Ie p61Ek = 61.5 log Ci/CeIntracellular concentration Ci = 100Extracellular concentration Ce = 10EK = 61 C log100/10 = -61 mV.

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