Which of the following is NOT a primary function of the skeletal system?

The primary functions of the skeletal system include providing shape and support to the body, protecting internal structures and organs, and playing a crucial role in the production of blood cells within the bone marrow. While the skeletal system is essential for these functions, producing hormones is not one of its primary roles. Hormones are typically produced by other systems in the body, such as the endocrine system, rather than directly by the bones. This distinction underscores the specific roles that different systems play in maintaining bodily functions. The skeletal system's lack of a direct role in hormone production differentiates it from certain other organ systems that are involved in this process.