Final answer:
The longest, largest, and strongest bone in the human skeleton is the femur, or thighbone, which is a long bone that functions as a lever for muscle-contracted movement.
Step-by-step explanation:
The longest, largest, and strongest bone in the human skeleton is the femur, or thighbone. The femur is a long bone, which means it is cylindrical in shape and longer than it is wide. The function of the femur, along with other long bones such as those in the arms and legs, is to act as levers that move when muscles contract.
The femur forms major joints at its ends: the hip joint at the proximal end with the pelvis, and the knee joint at the distal end with the tibia and patella. The patella, or kneecap, is a sesamoid bone embedded in the tendon of the femoral extensors that improves knee extension by reducing friction. The femur is not only critical for support and movement but also plays a significant role in the structure of the lower limbs, which are designed to bear the weight of the body and withstand the forces of locomotion.