All of the following statements about synovial fluid are true, Except –
**Core Concept**
Synovial fluid is a clear, thick liquid produced by the synovial membrane that lines the joints, tendons, and bursae. It plays a crucial role in reducing friction between the articular cartilage and the joint bones during movement, lubricating the joint, and providing nutrients to the cartilage.
**Why the Correct Answer is Right**
The correct answer is related to the composition and properties of synovial fluid. Synovial fluid contains hyaluronic acid, which is responsible for its thick, viscous consistency, and glycoproteins, which contribute to its lubricating properties. The fluid also contains hyaluronidase, an enzyme that breaks down hyaluronic acid, and lipids, which help to reduce friction between the joint surfaces.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because synovial fluid is not a sterile fluid. It contains white blood cells, such as neutrophils and macrophages, which help to fight off infections and repair damaged tissues.
**Option B:** This option is incorrect because synovial fluid is not a clear fluid. It has a thick, viscous consistency due to the presence of hyaluronic acid and other glycoproteins.
**Option C:** This option is incorrect because synovial fluid is not a clear fluid that is produced by the synovial membrane.
**Clinical Pearl / High-Yield Fact**
One important clinical correlation to remember is that synovial fluid analysis is a useful diagnostic tool in the evaluation of joint diseases, such as osteoarthritis, rheumatoid arthritis, and septic arthritis.
**Correct Answer: A. Synovial fluid is a sterile fluid.**