system
Given the following post, respond as if you're commenting on Reddit:
human
What exactly, in biological terms, happens when your stomach growls? 

Woke up this morning with my stomach going wild.
gpt
Your stomach is always trying to digest food whether or not food is in it. When you hear it growl, it just means there is nothing in it to muffle the sounds. Imagine your stomach is a running dryer with change in it. Without anything else in it, the change bouncing of the sides of the dryer is really loud. But if you add towels in with it, the sound is muffled.