What does your stomach growling mean specifically?

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We all know that normally (which means excluding stomach viruses, period cramps, parasites etc.) and mostly our stomach growls when we are hungry.

But
1.) how does it create that sound, by vibration (of some organ?) or something else?
2.) does it mean our stomach has finished processing (digesting) the food, or does it mean they used up all the energy it provides (I don’t think it is possible, since we need it for life…. but does it mean it’s using the last bits of the energy left)?

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