<prompt> Potassium in which compartment is responsible for cardiac and neural function?IntracellularExtracellularIntravascularExtravascular  <response>: ANSWER: A IntracellularREF: Guytons physiology 11th edition page 46 358, Ganongs 22nd edition chapter 1Potassium cations are important in neuron brain and nerve function, and in influencing osmotic balance between cells and the interstitial fluid Potassium is the most abundant cation in intracellular fluid. Phosphate is the most abundant intracellular anion. Sodium is the most abundant extracellular cation. Chloride is the most abundant extracellular anion. 