Digestion
Because digestion is a series of steps, your body also has to turn on the parts of the gut in order.
When food is about to go in your mouth, your stomach needs to turn on so it will be ready when the food reaches it. When food is in the stomach, the small intestine has to get ready for it. When the food reaches the small intestine, the stomach can turn off and the intestines must get to work.
The different parts of the gut have to talk with one another - to turn each other on and off.
Choose the 'Forward' link at the right to go on.