In this case, orexin stimulates your stomach to prepare for its ‘guest’ by secreting stomach acids that aid digestion.
It’s sort of like how you’d prepare a room for a houseguest – adding a vase of fresh flowers to the bedside table and filling up the toiletries cabinet.
In response to ghrelin, your brain will send back a messenger in the form of the hormone orexin that prepares the stomach to receive food. Your childhood cartoons got it right! According to an article by the Endocrinology and Metabolism Clinics of North America, when you’re hungry, your stomach dispatches a hunger hormone called ghrelin to your brain to demand it for food right now. It may be unsurprising to learn that the main cause of these stomach sounds is hunger. And much like how noises are much louder in an empty pipe as opposed to a pipe that has been filled with sponges, empty stomachs have a louder roar. The stomach and intestines are essentially hollow tubes made of muscle, so sounds that emanate from them are similar to the sound of water moving through pipes. The Genesis of the Growl Photo by Kristen Paulson on Flickr Known as ‘borborygmi’, pronounced as “baw-buh-rig-my” and sounding like the name of a deep-sea monster, these stomach sounds are produced in the stomach and the small and large intestines.
Has your stomach ever tried to do its best impression of a whale mating call? While this can be embarrassing (especially in a silent room), these sounds are a perfectly normal part of digestion. From a Rumble to a Roar: Why does your stomach growl?
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