Molecular Biologists Perform a Series of Experiments to Characterize the Electrophysiologic

Molecular biologists perform a series of experiments to characterize the electrophysiologic properties of human muscle cells.  The resting membrane potential for an isolated muscle cell is determined to be -70 mV.  The equilibrium potentials for important ions under normal physiologic conditions are as follows:E_Na = + 60 mV
E_K = - 90 mV
E_Cl = - 75 mV
E_Ca = + 125 mV
E_Mg = 0 mVIf physiologic conditions are maintained, which of the following ions would most likely flow out of the cell after opening of their respective ion channels?

A) Magnesium and calcium
B) Magnesium and chloride
C) Potassium and chloride
D) Potassium only
E) Sodium and calcium

Correct Answer:

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