AFAA Personal Trainer Certification 2026 – 400 Free Practice Questions to Pass the Exam

The upper leg bone is referred to as the femur. It is the longest and strongest bone in the human body, extending from the hip joint to the knee joint. Its primary function is to support the weight of the body during movement and to facilitate a range of activities such as walking, running, and jumping. The femur plays a crucial role in maintaining stability and mobility of the leg, making it essential for numerous physical activities.

The other bones listed have distinct locations and functions: the tibia and fibula are located in the lower leg, with the tibia being the larger bone that bears weight and the fibula providing support and stability. The radius, on the other hand, is one of the two bones in the forearm, unrelated to the leg at all. Therefore, the femur is accurately identified as the bone that specifically corresponds to the upper leg.