system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why my stomach "growl" and make noise?
gpt
The digestive system is a long tube that starts at your mouth and ends at... the end. The muscles in the intestines contract and push the food downward. This also helps turn the food, liquid and whatever else into a gooey mix. This is what results in a growling stomach.

Two hours after your stomach empties itself, the nerves send a message to the brain, which sends a message to your digestive system to restart the contractions. This gets any remaining food that is sitting there from the last time. These vibrations will make you hungry. They'll come and go every hour and last about 10 to 20 minutes until you eat something.

To avoid this happening in a quiet setting, eat many small meals a day instead of 2-3 large ones so your stomach doesn't have time to restart the process.