If K+ can exit the cell through leak channels, why don't they flow out until there are equal concentrations on both sides of the membrane?
A. Chelator molecules trap K+ on the inside of the membrane.
B. The negative electrical potential inside the cell creates a force that holds the K+ ions in.
C. K+ can act as an enzymatic cofactor, and most K+ ions are bound to cellular enzymes.
D. The leak channels allow a very slow leak that cannot keep pace with active import of K+ ions.
Answer: B
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