Answer to Question #43281 in Biology for dinisha

Question #43281
an action potential is an electrochemical change because it consist of polarity changes brought about by the movement of
A. Na^+ and Ca^+
B. K^+ and Ca^+
C. Na^+ and Ag^2+
D. Na^+ and Hg^+
E. Na^+ and K^+
Expert's answer
When a nerve cell is stimulated, ion gates in the plasma membrane open and Na+ instantly diffuses down its concentration gradient into the cell. The inside of the plasma membrane briefly becomes positive. Immediately, Na+ gates close and K+ gates open. K+ diffuses down its concentration gradient from the cell. The loss of positive potassium ions from the cell turns the inside of the membrane negative again. This quick up-and-down voltage shift, from the negative resting membrane potential (RMP)
to a positive value and then back to a negative value again, is called an action potential. The RMP is a stable voltage seen in a “waiting” cell, whereas the action potential is a quickly fluctuating voltage seen in an active, stimulated cell. Thus, the correct answer is E

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