Assume that in a cell at rest, only Na+ channels are open in the plasma membrane. This situation could arise if all other ion channels are blocked by the addition of pharmacological agents (i.e., blockers or inhibitors). Under this condition, what is the value of the membrane potential (Vm) in this cell?

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Physiology Test Question

Assume that in a cell at rest, only Na⁺ channels are open in the plasma membrane. This situation could arise if all other ion channels are blocked by the addition of pharmacological agents (i.e., blockers or inhibitors). Under this condition, what is the value of the membrane potential (V_m) in this cell?

	(A) The membrane potential is the same as the equilibrium potential for K⁺ (V_m = V_K).
	(B) The membrane potential is the same as the equilibrium potential for Na⁺ (V_m = V_Na).
	(C) The membrane potential is the same as the equilibrium potential for Cl⁻ (V_m = V_Cl).
	(D) None of the above is correct.
	(E) All of the above are possible.

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Posted: Monday, August 11, 2014
Last updated: Monday, August 11, 2014