Why does yawning make you yawn?!


Question:

Why does yawning make you yawn?

How does this work, i heard you yawn because you need more oxygen, but why do you need to yawn when you see people yawn, or when you talk about yawning, or even when someone yawns when your on the phone to them??
Thanks


Answers:

yawn.
your question made me yawn


The consumer health information on answer-health.com is for informational purposes only and is not a substitute for medical advice or treatment for any medical conditions.
The answer content post by the user, if contains the copyright content please contact us, we will immediately remove it.
Copyright © 2007-2011 answer-health.com -   Terms of Use -   Contact us

Health Categories