Final answer:
Friction between two bones is reduced by articular cartilage and synovial fluid, which lubricate and protect the joints during movement. Bursae also play a role in minimizing friction between various structures.
Step-by-step explanation:
What Reduces Friction Between Two Bones?
Friction between two bones in a joint is reduced by articular cartilage and synovial fluid. The articular cartilage provides a smooth, glassy surface that eases the movement of bones against each other. Additionally, synovial fluid, which is secreted by the synovial membrane, acts as a lubricant to minimize friction and wear in the joints. Furthermore, bursae, which are small sacs containing lubricating fluid, serve to reduce friction between structures such as skin and bone, muscles, or bone and tendon sheaths surrounding tendons, facilitating smooth movement across joints.