When my tummy rumbles, what’s actually causing that sound?

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Obviously I’m aware it’s not actually my tummy but my intestines, but what is the physical mechanism that creates the sounds that come from inside me? If I were having an operation on my abdomen, would they sound very loud? And are there other internal sounds going on in my body that I’m not able to hear, like does my liver make a noise, my uterus, my bone marrow etc?

In: Biology