One of the reasons we yawn is to cool our brains!
When you start to yawn, powerful stretching of the jaw increases blood flow in the neck, face, and head. The deep intake of breath during a yawn forces downward flow of spinal fluid and blood from the brain. Cool air breathed into the mouth cools these fluids.
When you start to yawn, powerful stretching of the jaw increases blood flow in the neck, face, and head. The deep intake of breath during a yawn forces downward flow of spinal fluid and blood from the brain. Cool air breathed into the mouth cools these fluids.
No comments:
Post a Comment
Note: only a member of this blog may post a comment.