Organ systems are groups of organs that work together to perform specific functions necessary for the survival and health of an organism. Each system is responsible for particular biological and physiological processes, and they interact with each other to maintain homeostasis—a stable internal environment. In humans and many other animals, the major organ systems include: 1. **Circulatory System**: Comprises the heart, blood, and blood vessels; responsible for transporting nutrients, gases, hormones, and waste products throughout the body.
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