Example : Human digestive system
Characteristics of the digestive system are:
1. They are made up of many organs that help in intake and utilisation of food.
2. Food is broken down into small components and then absorbed in the body.
3. The food moves down through peristalsis in higher animals.
4. It performs all the processes such as ingestion, digestion, absorption, assimilation, egestion.
5. The tract is continuous from mouth to anus.
6. The lumen is of this tract is continuous with the environment.