Which of the Following Situations Occurs in Electrically Excitable Cells

question 94

Multiple Choice

Which of the following situations occurs in electrically excitable cells?

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

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