I believe that happens only if you are really hungry. My belly only make that nise if I am very hungry. But I think it is because the stomach sends a signal to the brain end then the brain send another signal to the stomach throught the nerves warning the organism that they need to to eat. Much like when people feel pain when they get hurt or wounded.
The sound is from your intestines. Your whole digestive system propels food along, and when the intestines are empty, that propelling motion doesn’t have anything to move forward, so it makes vibrations in your body instead. Those vibrations cause the feeling and sound everyone knows as an “empty stomach”
Hope this helps!
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