Final answer:
Articular cartilage is found at the ends of long bones and acts as a shock absorber and reduces friction at the joint.
Step-by-step explanation:
The ends of long bones are covered with articular cartilage. Articular cartilage is a thin layer of cartilage that covers the ends of bones at synovial joints. It acts as a shock absorber and reduces friction between bones during movement. This allows for smooth and painless movement at the joint.