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?

Question

Quizplus · Accepted Answer

- A) There is indeed a concentration gradient across the cell membrane, as the concentration of Na⁺ is higher outside the cell (85 mEq/L) than inside (22 mEq/L). - D) A protein would be needed for Na⁺ to cross the cell membrane, as they cannot diffuse across the membrane due to their charged nature. Therefore, a transport protein would be needed for active or passive transport. - B and C) Na⁺ can be transported into or out of the cell, respectively, but the method would depend on the energy source (active vs. passive transport). However, the question does not give any information about the energy source, so both options could be possible.

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

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