Calculate E_Nafor a neuron that has an extracellular concentration of Na⁺of 78 mM and an intracellular concentration of Na⁺of 6 mM. A) -68.0 mV B) -1.14 mV C) 1.14 mV D) 31.6 mV E) 68.0 mV

Question

Quizplus · Accepted Answer

The Nernst equation calculates the equilibrium potential for Na+ as E_Na = (RT/zF) * ln([Na+]_outside/[Na+]_inside). At body temperature, this simplifies to E_Na = 61.5 * log([Na+]_outside/[Na+]_inside). Plugging in the values: E_Na = 61.5 * log(78/6) ≈ 68.0 mV.

Calculate ENafor a Neuron That Has an Extracellular Concentration of Na+of

Calculate E_Nafor a Neuron That Has an Extracellular Concentration of Na⁺of