work as lever
Long Bones A long bone is one that is cylindrical in shape, being longer than it is wide. Keep in mind, however, that the term describes the shape of a bone, not its size. Long bones are found in the arms humerus, ulna, radius and legs femur, tibia, fibula , as well as in the fingers metacarpals, phalanges and toes metatarsals, phalanges . Long bones function as levers; they move when muscles contract.