Which of the following is NOT a function of the skeleton?

The function of regulating body temperature is not a role of the skeleton. The primary functions of the skeletal system include providing structural support to the body, facilitating movement by serving as attachment points for muscles, protecting vital organs, storing minerals (like calcium and phosphorus), and producing blood cells in the bone marrow.

In contrast, the other options highlight important functions of the skeleton. The production of blood cells occurs in the bone marrow found within certain bones. The storage of fat relates to the yellow bone marrow present in some bones, where fat is stored as an energy reserve. Protection of vital organs is a crucial role of the skeleton, as bones such as the skull protect the brain, and the rib cage shields vital organs in the thoracic cavity, such as the heart and lungs. Thus, the regulation of body temperature falls outside the functions attributed to the skeletal system.