Why
Does Your Belly Growl?
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Description:
When you¡¯re extra hungry and all you can think about
is getting something to eat, your belly tends to rumble... but why? Why do our
bellies growl when we¡¯re hungry??
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Transcription:
When you're extra hungry and all you can think about
is getting something to eat, your belly tends to rumble. But why do our bellies
growl when we're hungry? Let's find out on today's episode of--"Colossal
Questions."
Well, it turns out there's a scientific term for the
sound your stomach makes, borborygmi, which is a Greek word that's an
onomatopoeia, meaning the word is supposed to sound like the noise it's
describing.
All that rumbling and growling you hear in your belly
is coming from either your stomach or intestines.
And it happens to everyone.
Usually we associated a rumbling belly with an empty
stomach but sometimes it can rumble even if you aren't hungry.
You see, whenever you eat food, the muscles in your
digestive tract push the food through your intestinal tubes, breaking it down
and absorbing the food's nutrients.
Your intestines are one long, hollow tube that runs
from your mouth all the way to your butt.
The walls are made of smooth muscle that squeeze and
expand, to mash up the digesting food.
As the food is broken down, gas and bubbles of air get
mixed in, and little pockets of air and gas cause that squeezing to make a
rumbling sound.
The noises are usually more muffled when your stomach
is full because the food absorbs most of the sound.
But when your belly is empty, those rumblings are much
louder and easier to hear.
An hour or two after a meal, your stomach will send
signals to your brain, letting it know that you're full and it's time to fire
up the digestive system.
The sounds start again a few hours later when your
belly is looking to digest more food.
So, it fires up the old stomach contractions, just to
check and see if anything got left behind from before.
Okay, so that's how stomach growls work, but we all
know when we're hungry.
So why does our body also make sounds to let us know?
Well, the feeling of your stomach contracting and
trying to digest food that isn't there is awfully uncomfortable.
That growly feeling of an empty stomach is a great
motivator to get up and go find some food.
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Questions:
1. What is the scientific term for the sound your
stomach makes when you're hungry, and what does it mean?
2. Why do stomach growls become louder and more
noticeable when your belly is empty?
3. How does the digestive system signal to your brain
that you're full or hungry?