Which of the following is true about interstitial space?

Interstitial space refers to the areas within tissues that lie between cells, filled with interstitial fluid, which is crucial for various physiological functions. The correct choice highlights the importance of this space in maintaining homeostasis, a process essential for keeping the body’s internal environment stable despite external changes. The interstitial fluid provides a medium through which nutrients, gases, and waste products can be exchanged between blood and cells, thereby supporting cellular metabolism and overall tissue function.

The other options do not accurately reflect the characteristics of interstitial space. For instance, it is not just cellular space filled with blood; rather, it contains fluid that bathes cells and facilitates nutrient and waste exchange. Additionally, while some fat cells may be present in certain tissues, interstitial space is composed largely of water and other substances, not solely fat cells. Finally, stating that interstitial space is devoid of any fluids contradicts its actual definition, as it is primarily characterized by the presence of interstitial fluid, which plays a vital role in tissue hydration and nutrient transport.