What is Intracellular Fluid?

Intracellular Fluid Definition

Intracellular fluid is the fluid that exists within the cells of multi-celled organisms. The intracellular fluid is therefore stored within the intracellular compartments of the body. Intracellular fluid is often referred to as cytosol when discussing cellular functions. The cytosol and the organelles and molecules contained within are referred to collectively as the cytoplasm. The opposite of the intracellular fluid is the extracellular fluid, which exists on the outside of the cells in the extracellular compartment of the body. Many cellular mechanisms and enzymes work to move products and wastes from the intracellular fluid to the extracellular fluid, while at the same time bringing in new nutrients and solutes to the intracellular fluid.