Which bone is the longest bone?

Which bone is the longest bone?

• A. Ulna
• B. Radius
• C. Clavicle
• D. Olecranon

Answer: (A)

The longest bone in the human body is the femur, which runs from the hip to the knee and is built to bear body weight and provide leverage for movement. The options given are all upper-extremity structures: the ulna is a forearm bone and is longer than the radius or the clavicle, but it is still much shorter than the femur. The olecranon is not a separate bone at all; it’s a bony prominence on the ulna. So, while the ulna may be the longest of the listed bones, the true longest bone overall is the femur.

The longest bone in the human body is the femur, which runs from the hip to the knee and is built to bear body weight and provide leverage for movement. The options given are all upper-extremity structures: the ulna is a forearm bone and is longer than the radius or the clavicle, but it is still much shorter than the femur. The olecranon is not a separate bone at all; it’s a bony prominence on the ulna. So, while the ulna may be the longest of the listed bones, the true longest bone overall is the femur.