Acation that is more abundant as a solute in the cytosol of a neuron than it is in the interstitial fluid outside the neuron is a) hco3-. b) cl-. c) ca++. d) na+. e) k+.

E) K+

Explanation:

The major cation in the intracellular fluid or cytosol is potassium (K+).

Within the interstitial fluid, the major cation is sodium(Na+) and the major anion is chloride(Cl-).

They all play an important role in maintaining homeostasis(the ability to maintain a relatively stable internal state that persists despite changes in the world outside).