Which system is responsible for protecting internal organs?

The musculoskeletal system is fundamental for protecting internal organs because it comprises bones, muscles, and connective tissues that create a framework for the body. The bones encase and shield vital organs; for instance, the rib cage protects the heart and lungs, while the skull safeguards the brain. Additionally, muscles provide support and aid in maintaining the position of organs, contributing to overall protection.

While the other systems listed have important functions—such as the nervous system coordinating bodily responses, the cardiovascular system transporting blood and nutrients, and the endocrine system regulating hormonal functions—none of them provide the structural protection that the musculoskeletal system does. The interplay of bones and muscles not only supports bodily movement but also serves as a critical barrier against physical injury to essential internal structures.