What is the primary function of the musculoskeletal system?

The primary function of the musculoskeletal system is to provide protection for vital organs while also facilitating movement. This system comprises bones, muscles, cartilage, tendons, and ligaments, all of which work together to support the body and enable a wide range of movements. For instance, the skeletal structure protects internal organs such as the heart and lungs, while the muscular system allows for locomotion and the stability needed for various physical activities.

The first option, related to the absorption of nutrients, pertains more to the digestive system rather than the musculoskeletal system. The third choice involves gas exchange, which is a function of the respiratory system, specifically the lungs. Lastly, while waste elimination is crucial for overall health, it is primarily governed by the excretory system, particularly the kidneys and urinary tract. Thus, option B correctly identifies the dual role of the musculoskeletal system in both safeguarding vital organs and enabling movement.