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The muscular system plays several crucial roles in the body, and one of its primary functions is to facilitate movement. Muscles contract and work in coordination to create movements, whether they are voluntary actions, like walking and grasping objects, or involuntary actions, like the beating of the heart or peristalsis in the digestive system.

Additionally, the muscular system is essential for supporting the skeletal structure. Muscles are attached to bones by tendons, and their contraction provides stability and helps maintain posture. This support is vital for the body's overall integrity and functionality.

Another important aspect of the muscular system is thermogenesis, or heat production. When muscles contract, they generate heat as a byproduct of energy expenditure, which plays a critical role in maintaining body temperature.

Considering these functions, the statement that all of the mentioned elements—supporting the skeletal structure, producing heat, and enabling movement—constitute primary functions of the muscular system is accurate. Each of these aspects highlights how the muscular system contributes to the overall functioning and well-being of the body.