Final answer:
The enlarged ends of long bones are called epiphyses, and they are covered with articular cartilage that facilitates smooth joint movement.
Step-by-step explanation:
Long bones have enlarged ends called epiphyses that are covered with articular cartilage.
A long bone is characterized by a central shaft, known as the diaphysis, and enlarged, rounded ends known as the epiphyses. The epiphyses are covered with articular cartilage for smooth joint movement and are where bones grow in length during development, thanks to the presence of growth plates or epiphyseal lines. Within the epiphyses is red bone marrow, which is crucial for blood cell production. Long bones include the femur, tibia, ulna, and radius, which function as levers for movement when muscles contract.