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The tibia, commonly referred to as the shinbone, is the larger and stronger of the two bones in the lower leg. Its primary function is to bear most of the weight during standing, walking, running, and other activities that involve the lower extremities. The tibia acts as a major weight-bearing structure of the leg, providing stability and support for both dynamic and static activities.

In addition to weight-bearing, the tibia plays a crucial role in transferring forces from the body to the foot and contributes to the overall structure of the leg. It also serves as an attachment point for various muscles and ligaments, aiding in movement and stability, but the main role remains its function as a weight carrier in the leg's anatomy.

The other options, while related to functions of the leg, do not accurately represent the tibia's primary role. Flexibility of the leg is managed more by muscle and tendon interactions. Protecting the knee joint is a function involving other structures, such as ligaments and the femur. Connecting muscles to bones is primarily the role of tendons, rather than the bone itself.