[A] : Most of the solutes in ECF and cytoplasm are electrolytes, i.e., electrically charged par- ticles or ions. Maintenance of an equilibrium between intracellular fluid and ECF is vitally essential for all cells.
[R]: This osmotic equilibrium is maintained by sodium and potassium pump of the cells. It operates with the help of a `Na^+, K^+` ATP as enzyme located in the cell membrane.
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false
