Final answer:
Synovial fluid is a key component of synovial joints, providing lubrication and transporting nutrients and wastes while working with articular cartilage to ensure smooth bone movement.
Step-by-step explanation:
Synovial fluid serves a critical role in the function of synovial joints by lubricating the joint, which reduces friction and allows for smooth movement of the bones. This fluid also distributes dissolved gases, nutrients, and wastes. The articulating surfaces of the bones at a synovial joint are covered with a layer of articular cartilage, a type of hyaline cartilage, which works with the synovial fluid to enable frictionless joint movement and protection for the underlying bone tissue.