Final answer:
Interstitial fluid, also known as tissue fluid or intercellular fluid, is the fluid that bathes and surrounds the cells of multicellular animals. It is responsible for the exchange of nutrients and waste products between cells and blood.
Step-by-step explanation:
Interstitial fluid, also known as tissue fluid or intercellular fluid, is the fluid that bathes and surrounds the cells of multicellular animals. It is part of the extracellular fluid (ECF) and is responsible for the exchange of nutrients and waste products between cells and blood. Interstitial fluid consists of a water solvent containing various substances such as amino acids, sugars, fatty acids, hormones, salts, and waste products from cells.