Which of the following situations occurs in electrically excitable cells?

A. Ligand-gated Na+ channels are opened by high extracellular Ca2+ levels.
B. When Na+ channels open, K+ channels close.
C. Proteins tend to diffuse out of the cell.
D. The sodium-potassium pump moves Na+ into the cell.
E. Depolarization causes voltage-gated Na+ channels to open.


Answer: E

Anatomy & Physiology

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