What does the skeletal system primarily do?

The primary function of the skeletal system is to provide structure and protection to the body. Bones form the framework that supports the body, giving shape and strength. This structure allows for the attachment of muscles, enabling movement. Additionally, the skeletal system plays a crucial role in protecting vital organs; for example, the rib cage safeguards the heart and lungs, while the skull encases the brain.

While other options mention aspects related to bodily functions, such as regulating hormones or facilitating movement, these are not the central roles of the skeletal system. Hormonal regulation is primarily managed by the endocrine system, energy production is a function of the metabolic processes within cells, and movement, although facilitated by the skeletal system in partnership with the muscular system, is not its sole responsibility. Thus, the answer highlights the essential functions of structure and protection that bones provide.