* The digestive system is an organ system responsible for breaking down food and absorbing nutrients. (This is a simple, straightforward explanation)
* Understanding how the circulatory and respiratory organ systems work together is crucial to understanding human health. (This emphasizes the interconnectedness of organ systems)
* Biologists study the intricate workings of the nervous system, a complex organ system that controls everything from movement to thought. (This showcases the complexity of organ systems)
* The organ system that filters waste from the blood is called the urinary system. (This is a specific example of an organ system and its function)
* The immune system, an organ system that protects the body from disease, is vital to our survival. (This highlights the importance of a specific organ system)