The intracellular fluid (ICF) compartment is the system that includes all fluid enclosed in cells by their plasma membranes. Extracellular fluid (ECF) surrounds all cells in the body. Extracellular fluid has two primary constituents: the fluid component of the blood (called plasma) and the interstitial fluid (IF) that surrounds all cells not in the blood.
Answer: Option 'a' is correct.
Explanation:
Fluid found inside cells is known as intracellular fluid.
As human cells are filled in with fluids both inside and outside of the cell.
All fluid outside the cell known as extracellular fluid which is separated by semipermeable membrane around the cell. This membrane helps fluid to flow in and out but restricted the entry of unwanted materials to get in.
Thus, Intracellular fluid is the correct answer.
