If K⁺ Can Exit the Cell Through Leak Channels,why Don't

question 10

Multiple Choice

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)K⁺ can act as an enzymatic cofactor,and most K⁺ ions are bound to cellular enzymes.
• B)The leak channels allow a very slow leak that cannot keep pace with active import of K⁺ ions.
• C)Chelator molecules trap K⁺ on the inside of the membrane.
• D)The negative electrical potential inside the cell creates a force that holds the K⁺ ions in.

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