Final answer:
Long bones have a central shaft and two rounded ends, and examples include the femur and tibia.
Step-by-step explanation:
Long bones have a central shaft, called the diaphysis, and two rounded ends, called the epiphyses. The diaphysis contains bone marrow and the epiphyses are covered with articular cartilage and filled with red bone marrow. Examples of long bones include the femur, tibia, ulna, and radius.