Body systems are groups of organs and structures that work together to perform specific functions essential for maintaining life. For example, the circulatory system includes the heart and blood vessels, which transport oxygen and nutrients throughout the body. Other systems, like the digestive system, break down food to provide energy and nutrients. Each body system plays a crucial role in overall health. The nervous system controls and coordinates actions by sending signals between different parts of the body, while the respiratory system allows for the exchange of oxygen and carbon dioxide. Together, these systems ensure the body functions effectively.