Which statement is true about the muscular system?

The muscular system plays multiple critical roles in the body, supporting functions essential for survival and overall health. One of its primary functions is assisting with movement, allowing the body to execute a wide variety of motions, whether voluntary or involuntary. In addition to facilitating movement, the muscular system also contributes to the body's thermoregulation by generating heat during muscle contractions, which is vital for maintaining body temperature. Furthermore, muscle tissue, specifically cardiac muscle, is responsible for pumping blood throughout the body, ensuring that oxygen and nutrients reach vital organs and tissues.

Since all these functions—movement, heat production, and blood circulation—are integral to the operations of the muscular system, the statement that all of the above is true is accurate. Each of these roles demonstrates the complexity and importance of the muscular system in maintaining homeostasis and supporting bodily functions.