The Electrochemical Gradient of a Given Ion Determines the Movement

question 7

Multiple Choice

The electrochemical gradient of a given ion determines the movement of that ion across a cell membrane.Based on your knowledge of the normal intra- and extracellular concentrations of Na⁺ and K⁺ ions across a resting membrane, what would you expect to happen when both Na⁺ and K⁺ voltage-gated channels were opened in response to an action potential?

• A) Na⁺ and K⁺ would both move out of the cell.
• B) Na⁺ would move into the cell, whereas K⁺ would move out of the cell.
• C) Na⁺ would move out of the cell, whereas K⁺ would move into the cell.
• D) Na⁺ and K⁺ would both move into the cell.
• E) Na⁺ would move out of the cell but K⁺ flow would cease.

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