At the peak of the neuronal action potential, Vm is approximately +50 mV. Assuming normal intracellular and extracellular K+ concentrations (see here), approximately what is the driving force (in mV) that acts on K+ ions at the peak of the action potential?

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Physiology Test Question

At the peak of the neuronal action potential, V_m is approximately +50 mV. Assuming normal intracellular and extracellular K⁺ concentrations (see here), approximately what is the driving force (in mV) that acts on K⁺ ions at the peak of the action potential?

	(A) −150 mV
	(B) +150 mV
	(C) +100 mV
	(D) −100 mV
	(E) +50 mV

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Posted: Wednesday, July 16, 2014
Last updated: Monday, August 11, 2014