2006-09-07 03:45:15 · 21 answers · asked by GeorgieP 4 in Health ➔ General Health Care ➔ Other - General Health Care
The need for more oxygen
2006-09-07 03:46:30 · answer #1 · answered by hotmillsmandy 1 · 0⤊ 0⤋
According to Robert Provine, a psychologist who studies yawning, extra oxygen isn't the cause. yawning may be a stretch for the head and neck, but yawns also stop the oxygen-carrying blood from leaving the brain, so yawning may wake us up too. he also found that yawns are more contagious than smiles, which i found true, since i just yawned.
2006-09-07 03:57:54 · answer #2 · answered by Brittney 3 · 1⤊ 0⤋
Not enough oxygen getting into the lungs. When we are tired our system slows down and and as a result we yawn
2006-09-07 03:48:08 · answer #3 · answered by keenie 3 · 0⤊ 0⤋
I once heard that yawning was actually a sign of attention... In the sense that you want to stay awake and your brain needs the extra oxygen to do so.
2006-09-07 03:53:24 · answer #4 · answered by Beto 3 · 0⤊ 0⤋
The yawning is caused by lack of oxygen to the brain.
Our brain sends a signal, breath deeper, and longer, and it results in a yawn.
People tend to breath shallow and slow when they are tired.
2006-09-07 03:48:44 · answer #5 · answered by LaceyPie 3 · 1⤊ 0⤋
When the interlocutor, the meeting or the conference is soporific and we need a dose of fresh oxygen to stay awake.
> why do we yawn when we're tired?
2006-09-07 03:51:28 · answer #6 · answered by par1138 • FCD 4 · 0⤊ 0⤋
When we lived in caves and the leader of the tribe wanted the family to settle down he would yawn to let them know it was time for beddy byes.
That is why they are contagious.
Really it's true.
2006-09-07 04:01:10 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Yawn is the first "pop up" known to exist. The balloon has yet to evolve.
2006-09-07 03:53:42 · answer #8 · answered by Anonymous · 1⤊ 0⤋
To get more oxygen into the system.
2006-09-07 04:58:17 · answer #9 · answered by Holly the second 1 · 0⤊ 0⤋
To get more oxygen into our brain, why it is catching I just don't know.
2006-09-07 03:47:40 · answer #10 · answered by Cj 4 · 0⤊ 0⤋