The Digestive System

The Digestive System
Human body is made up of countless millions of cells. Food is needed to build up new cells and replace the worn out cells. However, the food that we take must be changed into substance that can be carried in the blood to the places where they are needed. This process is called digestion.
The first digestive process takes place in the mount. The food we eat is broken up into small pieces by the action of teeth, mixed with saliva, a juice secreted by glands in the mount. Saliva contains digestive juices which moisten the food. So, it can be swallowed easily.
From the mount, food passes through the esophagus (the food passage) into the stomach. Here, the food is mixed with the juices secreted by the cells in the stomach for several hours. Then the food enters the small intestine. All the time the muscular walls of the intestine are squeezing, mixing, and moving the food onwards.
In a few hours, the food changes into acids. These are soon absorbed by the villi (microscopic b ranch projections from the intestine walls) and passed into the bloodstream.

By : Noviana Watiningsih