The figure illustrates changes in the membrane potential during an action potential. What does "D" represent?
A. Local potential
B. Repolarization
C. Afterpotential
D. Depolarization
E. Threshold
Answer: E
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A) buffer stomach acid. B) buffer carbonic acid formed by carbon dioxide. C) limit pH changes caused by organic and fixed acids. D) buffer the urine. E) increase ventilation.
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