An organ system is a group of organs that work together in the body to perform a complex function, such as pumping blood or processing and utilizing nutrients. There are 11 major organ systems in the human body:
- The circulatory (cardiovascular) system
- The lymphatic system
- The respiratory system
- The integumentary system
- The endocrine system
- The gastrointestinal (digestive) system
- The urinary (excretory) system
- The musculoskeletal system
- The nervous system
- The reproductive system
- The immune system
