Which of the following is not a function of synovial fluid?

Which of the following is not a function of synovial fluid?

A. shock absorption

B. increases osmotic pressure within joint

C. lubrication

D. provides nutrients

E. provides articular cartilages

Answer: B. increases osmotic pressure within joint

The synovial fluid is a thick, milky liquid that fills the spaces between the bones of the synovial joints i. e., knee or elbow joints. The roles associated with synovial fluid include smoothing the two articular cartilage surfaces to decrease friction during movement, acting as a lubricant to lessen friction in the articulation of joints, and serving as a shock absorber to stress-induced in the joint by mechanical forces. Furthermore, synovial fluid has the function of delivering substances to, as well as to withdraw products from the articular cartilage since this tissue is avascular. However, it is important to note that the raising of osmotic pressure within the joint cavity is not among the roles of the synovial fluid. Although the synovial fluid of a joint is often compared to plasma in terms of the osmotic pressure of the solution, its primary function is to deposit a thin fluid film to minimize friction and protect the joint during physical activity. It is designed for the protection of the epithelium which requires nutrients as well as lubrication rather than the osmotic balance.