cell See all media Category: Science & Tech Related Topics: cell fluid cytoplasm cytosol (Show more) See all related content → intracellular fluid, substance within living cells that is made up primarily of water and molecules such as dissolved ions and is a major component of the cytoplasm and cytosol. A variety of chemical reactions within cells take place in the cytoplasm and therefore the intracellular fluid. The intracellular fluid bathes cellular organelles, and, in adult humans, it accounts for about 40 percent of total body weight. Intracellular fluid is distinguished from extracellular fluid, which is found between cells in multicellular organisms and serves to conduct nutrients, waste products, and other substances throughout the tissues of the body. Relative to extracellular ...(100 of 365 words) Access the full article Help support true facts by becoming a member. Subscribe today!