What is the name of the long heavy bone that forms above the knee?

The long heavy bone that forms above the knee is known as the femur. It is the largest and strongest bone in the human body, extending from the hip or pelvis down to the knee. Its primary functions include supporting the weight of the body during walking, running, and jumping, as well as providing stability and mobility to the leg. The femur also plays a crucial role in forming the hip joint at the upper end and the knee joint at the lower end, making it integral to lower limb movement and function.

The other options, such as the humerus, tibia, and radius, serve different roles in the skeletal system. The humerus is the bone of the upper arm, while the radius and tibia are associated with the forearm and lower leg, respectively. Understanding the specific roles and locations of these bones is essential in the study of human anatomy, particularly for those pursuing a career in esthetics or any healthcare-related field.