What happens to the food we eat? Children's conceptions of the structure and function of the digestive system

This paper is concerned with children's conceptions of the structure and function of the human digestive system. It is based on data from an investigation carried out with 45 children between the ages of four and ten. The results indicated that (1) children possess biological knowledge as an independent knowledge domain from the age of 4; (2) the acquisition of the concept of digestion leads to a conceptual revision and enrichment; (3) the concept of transformation can constitute an obstacle to comprehension of the scientific model of the functions of the digestive system.