Intracellular fluid (ICF) is found only within:

Intracellular fluid (ICF) is defined as the fluid contained within the cells of the body. It plays a critical role in several cellular functions, including maintaining cellular homeostasis, facilitating metabolic processes, and enabling intracellular communication. The majority of the body's total water content is found in the intracellular fluid compartment, which is essential for the proper functioning of the cells.

Body tissues encompass both intracellular and extracellular fluids, so while ICF is present in tissues, it is specifically located within the cellular structures. Blood vessels contain plasma, which is part of extracellular fluid, not intracellular fluid. Extracellular compartments refer to all fluid outside the cells, such as interstitial fluid and plasma, thus excluding ICF which is solely found within the cells. This is why cells of the body are identified as the correct location for intracellular fluid.