What is the primary function of the skeletal system?

The primary function of the skeletal system is to provide protection for major internal organs. The skeletal system comprises bones, cartilage, ligaments, and tendons, which collectively play a crucial role in maintaining the structure of the body. Bones act as a protective shield for vital organs; for instance, the rib cage safeguards the heart and lungs, while the skull encases the brain.

Furthermore, the skeletal system offers support and stability for the body, allowing for movement in conjunction with the muscular system. While each of the other options describes important bodily functions—such as reproduction, circulation of blood, and respiratory processes—they do not specifically pertain to the functions of the skeletal system. Only the protective role directly aligns with what the skeletal system is fundamentally designed to do.