What is the primary role of the skeletal system?

The skeletal system serves as the framework for the body, providing structure and shape. It supports tissues and organs, allowing them to maintain their positions and function effectively. In addition to structural support, the skeletal system plays a critical role in protecting vital organs; for instance, the rib cage shields the heart and lungs, while the skull encases the brain.

Moreover, the skeletal system is involved in movement, working in conjunction with muscles. It acts as levers that muscles can pull against, enabling locomotion and various physical activities. The bones also house bone marrow, which is essential for producing blood cells, further highlighting the system's importance in maintaining overall health.

In contrast to the other choices, which pertain to different bodily functions—gas exchange, hormone production, and electrical signal transmission—the primary role of the skeletal system is centered around providing structure, support, and encasing vital organs, making it essential for both protection and movement.