What is the primary role of interstitial fluid in the body?

The primary role of interstitial fluid is to facilitate the transport of nutrients, as it serves as the medium through which essential substances, such as ions, nutrients, and waste products, move between blood vessels and tissues. Interstitial fluid fills the spaces between cells in tissues, creating a crucial environment for the diffusion of molecules necessary for cellular function and overall tissue health. This fluid ensures that nutrients delivered by the blood can reach individual cells effectively, while also assisting in the removal of waste products generated by cellular metabolism. Thus, the function of interstitial fluid in nutrient transport is vital for maintaining the health and metabolic activity of cells throughout the body.