Which system of the body includes the bones and voluntary muscles?

The musculoskeletal system encompasses both the bones and the voluntary muscles, making it responsible for providing structure, support, and movement to the body. Bones serve as the framework, protecting vital organs and facilitating movement by serving as attachment points for muscles. The voluntary muscles, which are primarily skeletal muscles, enable conscious movements and are essential for activities like walking, lifting, and other physical actions. Together, these components work in harmony to allow for mobility and physical function, while also contributing to overall body stability and posture.

In contrast, the endocrine system focuses on hormone secretion and regulation, the nervous system is involved in processing sensory information and coordinating responses, and the circulatory system is responsible for the transport of blood, nutrients, and gases throughout the body. None of these systems combine bones and voluntary muscles as the musculoskeletal system does.