The Concentration of Na⁺ Outside a Cell Is 85 MEq/L

question 52

Multiple Choice

The concentration of Na⁺ outside a cell is 85 mEq/L and inside the cell is 22 mEq/L. Which of the following is correct is such a situation?

• A) There is a concentration gradient across the cell membrane.
• B) Na⁺ can cross into the cell by active transport.
• C) Na⁺ can diffuse out of the cell by passive transport.
• D) A protein would be needed for Na⁺ to cross the cell membrane in either direction.
• E) a and d
• F) b and c
• G) All of the above are true in this particular scenario.

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