National Health Science Certificate Practice Exam

The skeletal system primarily provides structure, enables movement, and stores minerals. Bones form the framework that supports the body and gives shape, allowing us to stand and move. They work with muscles and joints to produce motion—muscles pull on bones, which act as levers around joints to create movement. Bones also serve as a mineral reservoir, especially for calcium and phosphorus; when the body needs minerals, bone tissue can release them to help maintain mineral balance and support metabolic needs. In addition, bone marrow within certain bones produces blood cells, and the rib cage and skull protect vital organs.

Other options don’t fit as the main role: producing hormones is the job of endocrine tissues, regulating body temperature is mainly achieved through metabolism and skin, and oxygen transport is handled by blood and the circulatory system.