試題詳解

5. The membrane serves as an insulator that separates the environments inside and outside the cell. The membrane potential is the difference in electric potential between the interior and the exterior of a biological cell. Assume that the interior of a cell has a lower electric potential compared to the exterior of a cell, and the K+ (potassium ion) concentration inside the cell is higher than that outside the cell. If no ions (such as Na⁺, Ca²⁺, etc.) can enter or leave the cell except the potassium ions through some holes on the membrane, which of the following is true?
(A) The potassium ions will enter the cell, which increases the membrane potential
(B) The potassium ions will leave the cell, which increases the membrane potential
(C) The potassium ions will enter the cell, which decreases the membrane potential
(D) The potassium ions will leave the cell, which decreases the membrane potential

(E) None of the above