Which of the following bones is considered the longest?

The femur is considered the longest bone in the human body. It is the bone of the thigh and stretches from the hip to the knee, playing a critical role in supporting the weight of the body during various activities such as walking, running, and jumping. Its length is necessary for mobility and stability, especially in bipedal locomotion.

In contrast, the radius and ulna are both bones of the forearm. The radius is located on the thumb side of the forearm, while the ulna is on the opposite side. Although they are important for arm movement and function, they are significantly shorter than the femur.

The humerus is the bone of the upper arm, extending from the shoulder to the elbow. While it is longer than both the radius and ulna, it still does not match the length of the femur.

Understanding the relative lengths and functions of these bones helps clarify why the femur is recognized as the longest bone in the human body.