human
What is the difference between a femur and an ulna?
assistant
The main difference between a femur and an ulna is that the former is part of the lower limb, while the latter is part of the upper limb. The femur is the longest bone in the body and provides most of the weight-bearing support for the body. It also helps to form the knee joint, which allows movement of the leg. In contrast, the ulna is located on the outside of the forearm and forms the wrist joint.