👉 Tract fluid, also known as synovial fluid, is a viscous, lubricating substance produced by the synovial membranes lining the joints in the human body. It serves multiple crucial functions, including reducing friction between the articular cartilage surfaces during joint movement, nourishing the cartilage cells, and removing metabolic waste products. The fluid's composition is rich in hyaluronic acid, which contributes to its viscosity and lubricating properties, and it contains proteins, glucose, and electrolytes that support joint health. There are different types of tract fluid, with synovial fluid being the most abundant and vital for joint function.