Final answer:
Synovial joints have structures like the articular capsule and synovial fluid that lubricate the joint, nourish its components, absorb shock, and protect the articular cartilage. These joints also house stem cells for tissue repair.
Step-by-step explanation:
The structures that function to lubricate the joint, provide nourishment to the structures in the joint, contain stem cells for tissue repair, and also absorb shock are known as synovial joints. These joints have a special connective tissue called the articular capsule which encloses the joint cavity. Within the capsule, there is a lubricating fluid secreted by the synovial membrane which reduces friction and allows for smooth movements. The articular cartilage, a thin layer of hyaline cartilage that covers the articulating surfaces of bones at a synovial joint, functions to protect the ends of bones by providing a smooth, slippery surface that limits wear and tear during joint movement.