The longest bone in the body is the _____, or thigh bone.

The longest bone in the body is the _____, or thigh bone.

• A. Tibia
• B. Fibula
• C. Radius
• D. Femur

Answer: (D)

The longest bone in the body is the femur, the thigh bone. It runs from the hip to the knee and is built to bear most of the body's weight and generate strong leverage for walking and running. In adults, it’s typically about 45 to 50 centimeters long—roughly a quarter of the person's height—making it longer than any other bone. The tibia, the shin bone, is long and weight-bearing but shorter than the femur, while the fibula is a thinner bone on the outside of the leg that mainly provides muscle attachment and ankle stability. In the arm, the radius is another long bone, but it’s shorter than the leg bones. So, the femur stands out as the longest bone.

The longest bone in the body is the femur, the thigh bone. It runs from the hip to the knee and is built to bear most of the body's weight and generate strong leverage for walking and running. In adults, it’s typically about 45 to 50 centimeters long—roughly a quarter of the person's height—making it longer than any other bone.

The tibia, the shin bone, is long and weight-bearing but shorter than the femur, while the fibula is a thinner bone on the outside of the leg that mainly provides muscle attachment and ankle stability. In the arm, the radius is another long bone, but it’s shorter than the leg bones. So, the femur stands out as the longest bone.