What makes a stomach growl?

Answer 1

The digestion process, acids breaking down food creates gasses, and muscles moving the food and gasses.

Answer 2

The rumbles, gurgles and growls you sometimes hear from your abdomen typically are due to normal digestion. Stomach growling can occur when you're hungry. But it can also occur after eating or between meals when food is passing through your intestines.

Hunger and appetite are controlled by a complex system of hormone-like substances primarily made by your digestive system. When you haven't eaten for a while, these substances are released and cause a part of your brain called the hypothalamus to "switch on" your desire to eat. A message is then sent to your stomach and intestines. This triggers muscle contractions and the release of acids and other digestive fluids as your body prepares for you to eat — or hopefully eat. The thought, sight or smell of food also can trigger this same response — growling, rumbling and gurgling — from your intestines.

Sometimes, stomach growling or rumbling can be a symptom of an underlying gastrointestinal disorder, for example, irritable bowel syndrome. But in such cases, excessive abdominal noise usually is accompanied by other symptoms such as bloating, cramping, diarrhea or excess gas.
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Answer 3

when you have food in your system it moves along the digestive tract right?
well when there is no food, air just moves and therefore it makes a rumbling noise known as your stomach growling...

Answer 4

borborygmus
a rumbling or gurgling sound caused by the movement of gas in the intestines.
:)