Which of the following represents the amount of interstitial fluid in the body?

The correct answer reveals an important aspect of human physiology, particularly regarding body fluid compartments. Interstitial fluid makes up a significant portion of the extracellular fluid in the body, which is the fluid found outside of cells. While the total body fluid is divided into intracellular fluid and extracellular fluid, the interstitial fluid specifically refers to the fluid that bathes the cells in tissues.

The percentage that represents interstitial fluid is around 15% of total body weight. This value reflects the balance of fluids necessary for nutrient transport, waste removal, and maintenance of homeostasis. Understanding this balance is crucial for various medical assessments and interventions, as shifts in interstitial fluid can indicate health issues such as edema or dehydration. This context helps clarify why the identification of interstitial fluid's proportion relative to total body weight is relevant in medical study and practice.