👉 A running fluid, also known as synovial fluid, is a viscous, lubricating substance found within the cavities of synovial joints in the human body. This fluid acts as a cushion, reducing friction between the articular cartilage surfaces during joint movement, thereby facilitating smooth and pain-free motion. It also provides nutrients to the cartilage, helps remove metabolic waste products, and maintains the joint's overall health. Composed primarily of water, proteins, hyaluronic acid, and various electrolytes, running fluid is essential for joint function and mobility.
