An organ system is a functionally related group of organs in the human or animal body. The term “apparatus” has become a synonym for “system”. This grouping is the basis of the "systematic anatomy ". For example, the digestive system (or digestive system ) includes all organs that are responsible for intake ( lips , oral cavity ), crushing ( teeth ), transport ( esophagus ), enzymatic digestion and absorption of food ( gastrointestinal tract , Liver , pancreas ) and the elimination ( rectum , anus ) of non-usable residual products.
This classification does not take into account that there are numerous overlaps and interactions between the organ systems, i.e. no organ system acts independently of the others. The digestive system is supplied with blood by vessels ( cardiovascular system ), controlled by nerves ( nervous system ), and excrement is supported by the abdominal muscles ( musculoskeletal system ). In addition, it plays a role in defense processes and some of the absorbed nutrients are transported away via the lymph . Another problem with the division into organ systems is multiple functions. So has z. B. the liver diverse functions and could be counted among several organ systems. The sense organs also belong to the nervous system in the broader sense .
A distinction is made between the following organ systems in humans: