What make you yawn?
Answer:
No one really knows for sure, or even why we yawn, but some studies enjoy been done on this phenomenon. One popular explanation is that yawning allows you to grasp rid of too much carbon dioxide in your system and increase your oxygen supply, but this have been disproven. You can read more at these links.
http://www.howstuffworks.com/question572...
http://www.world-science.net/exclusives/...
i don't know but thinking give or take a few yawning makes you yawn. thinking almost being tired usually does it too.
What make us yawn is that we are of want to sleep that is the idea why we yawn.
being tired but i thought it be cause u needed more oxygen
no its not have enough oxygen contained by your lungs. you yawn when you're tired, or you have be like, sitting for a long time.
when your body desires to get oxygen to the brain
You yawn because you're not getting adequate oxygen to your brain.
Lots of different theories exist, but it is a reflex controlled by the brain.
http://faculty.washington.edu/chudler/ya...
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