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Biology/chemistry/medicine question

In their resting state, all body cells exhibit a resting membrane potential (RMP). The main determinant of the RMP is the :

A Amount of intracellular protein anions
B Membrane’s permeability and concentration gradient for potassium ions
C High membrane permeability to sodium ions compared to potassium ions
D Activity of the antiport transport, the only mechanism by which intracellular potassium can cross the membrane
E Amount of sodium ions pumped out of the cell

I'm stuck between B and E, help?
Original post by qwerty123A
In their resting state, all body cells exhibit a resting membrane potential (RMP). The main determinant of the RMP is the :

A Amount of intracellular protein anions
B Membrane’s permeability and concentration gradient for potassium ions
C High membrane permeability to sodium ions compared to potassium ions
D Activity of the antiport transport, the only mechanism by which intracellular potassium can cross the membrane
E Amount of sodium ions pumped out of the cell

I'm stuck between B and E, help?


It's B, a cell's resting potential is usually around about the value of the membrane potential for potassium (found using the Nernst equation or some **** like that).

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