What ion is responsible for the repolarization phase of the muscle action potential, and in what direction does this ion move across the muscle fiber membrane? Group of answer choices Ca+2 in Mg+ out K+ out Na+ in Cl- in
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Step 1: During the repolarization phase of the muscle action potential, the membrane potential returns to a more negative value after depolarization. Show more…
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Molecular biologists perform a series of experiments to characterize the electrophysiological 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 physiological conditions are as follows: ENa = +60 mV, EK = -90 mV, ECl = -75 mV, ECa = +125 mV, EMg = 0 mV. If physiological 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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