Which is a function of the musculoskeletal system? Select all that apply.

A. Production of red blood cells: Hematopoiesis occurs within the red bone marrow found in the epiphyses of long bones and the cavities of flat bones. This process is responsible for the continuous generation of erythrocytes, leukocytes, and thrombocytes. It is a critical physiological role of the skeletal component of the system. B. Protection of organs: The skeletal structure provides a rigid framework that encases and shields vulnerable internal viscera from mechanical trauma. Examples include the cranium protecting the brain and the thoracic cage safeguarding the heart and lungs. This structural barrier is essential for the survival of vital organs. C. Energy production: While muscles utilize adenosine triphosphate (ATP) for contraction, the musculoskeletal system is not a primary site for the biochemical production of energy. Energy synthesis via cellular respiration occurs in the mitochondria of all cells, primarily fueled by glucose and lipids. It is a metabolic process rather than a system function. D. Movement/mobility: Muscles act as the primary engines of the body by contracting and pulling on bones to create levers across joints. This allows for both gross motor activities like walking and fine motor tasks such as writing. It is the most visible and fundamental function of the musculoskeletal system. E. Reservoir for minerals: Bone tissue serves as a dynamic storage site for essential minerals, specifically calcium and phosphorus. The skeletal system releases these minerals into the bloodstream as needed to maintain homeostatic levels for nerve conduction and muscle contraction. It acts as a biological bank for mineral electrolytes.