The fluid is used as a coolant and also lubricates the cutting surfaces.
This lining produces a fluid that lubricates the joint and when affected by rheumatoid arthritis it becomes inflamed and swollen.
The idea behind a throat spray is that it lubricates the tissues in your throat and keeps them from moving when you breathe.
Mucus is a complex mixture of salts, water, sugars, and proteins that cleanses, lubricates, and protects many passageways in the body, including those in the lungs and pancreas.
This membrane produces a supply of synovial fluid which fills the joint cavity, lubricates it, and helps the articular bones move smoothly about the joint.