What is the primary function of the skeletal system in the human body?

The skeletal system's primary function is to provide support and structure to the body. This framework is essential for maintaining the body's shape and facilitating movement by acting as an anchor point for muscles. The bones of the skeleton bear weight and help withstand forces applied during various activities, allowing the body to function effectively against gravity.

In addition to support and structure, the skeletal system also plays roles in protection, mineral storage, and producing blood cells. While protection of organs, such as the brain and heart, is a critical function, it is not the primary role of the skeletal system when considering its overall contributions. Similarly, although the skeletal system does store minerals like calcium and phosphorus, and produces red blood cells in the bone marrow, these functions are secondary to its role in providing a solid framework for the body. Therefore, the main defining characteristic of the skeletal system is its supportive role, making that the most appropriate answer.