Final answer:
The three major fluid compartments in the human body are intracellular fluid (ICF), extracellular fluid (ECF), and interstitial fluid (IF).
Step-by-step explanation:
The three major fluid compartments in the human body are the intracellular fluid (ICF), extracellular fluid (ECF), and interstitial fluid (IF). The ICF is the fluid found within cells, while the ECF surrounds cells in the body. The ECF has two primary constituents: plasma, which is the fluid component of blood, and the IF, which surrounds cells not in the blood.