Answer the following question given this paragraph: 

Potassium Potassium is the major intracellular cation. It helps establish the resting membrane potential in neurons and muscle fibers after membrane depolarization and action potentials. In contrast to sodium, potassium has very little effect on osmotic.


Q: What is the major intracellular cation?

 Choices:

- magnesium

- sodium

- glucose

- potassium

A:
potassium
