The primary function of a bone is to provide structural support to the body, allowing for movement, protection of vital organs, and storage of minerals. Bones form the skeletal system, which serves as the framework for the body, enabling it to maintain shape and posture. Additionally, bones play a crucial role in producing red and white blood cells within the bone marrow, contributing to the body's immune response and overall health. They also store essential minerals such as calcium and phosphorus, which are vital for various physiological functions.