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Question of the Day (IMO)

rpk1988

90210
Dec 6, 2004
2,789
0
Maryland
What causes people to yawn? Of course it is a sign that you are tired, but what excactly causes you to yawn.

Rant on.
 

Changleen

Paranoid Member
Jan 9, 2004
14,350
2,461
Pōneke
When you are tired or relaxed, you don't breathe as deeply as maybe you should in order to introduce fresh air into your whole lungs. Yawning is caused by your body sensing it has excess CO2 in your lungs. It is a mechanism to get a big volume of fresh air and flush out all that old CO2.
 

Tame Ape

BUY HOPE!!!!!!!
Mar 4, 2003
2,284
1
NYC
Changleen said:
When you are tired or relaxed, you don't breathe as deeply as maybe you should in order to introduce fresh air into your whole lungs. Yawning is caused by your body sensing it has excess CO2 in your lungs. It is a mechanism to get a big volume of fresh air and flush out all that old CO2.
What about when some else yawns first and then you break out in a yawn?
 

BurlyShirley

Rex Grossman Will Rise Again
Jul 4, 2002
19,180
17
TN
Changleen said:
When you are tired or relaxed, you don't breathe as deeply as maybe you should in order to introduce fresh air into your whole lungs. Yawning is caused by your body sensing it has excess CO2 in your lungs. It is a mechanism to get a big volume of fresh air and flush out all that old CO2.
Chang, that is a theory from 15 years ago that has since been debunked.
Well, I heard that anyway.
 

mindlessfr

Monkey
Sep 8, 2004
260
0
richmond, va
myth busters actually did a show on wether or not yawning was contagious but i cant really remember the whole show, all i remember is yawning over 67 times i lost count after 20 minutes
 

the BIG cheese

The STUFF
Feb 26, 2002
228
0
stick red
I read an article in a month or two ago about it. Some guy at some university (my documentation is great isnt it) says that after a study he concluded that yawning expresses empathy between mamals, including us. That explains the contageous aspect and it also means that we are paying attention best when we yawn.......
 

Zark

Hey little girl, do you want some candy?
Oct 18, 2001
6,254
7
Reno 911
blt2ride said:
I've always wondered why peoples' eyes water when they yawn. Does a yawn affect the tear duct?
It usually has to do with boring someone to tears:rofl:
 

rpk1988

90210
Dec 6, 2004
2,789
0
Maryland
Yea I never understood why you teared when you yawned. It always makes people think you are sad or something after a good yawn.