Molecular Biologists Perform a Series of Experiments to Characterize the Electrophysiologic

question 63

Multiple Choice

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

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