what is there to a yawn.and is it really contageouus?

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Answers:
Lack of air to the brain. Yes it is contagious. Your brain registers someone else yawning and decides to "double check" that it has enough air as well so it triggers a yawn.

Other Answers:
lack of air to the brain

Yawning is the body's physiological response to increase the amount of oxygen getting into your system.it is contageous in a sense cause your eyes can send a message to your brain to tell you to breath a little bit more.

A yawn is a reflex of deep inhalation and exhalation associated with being tired, with a need to sleep, or from boredom. The word "yawn" has evolved from the Middle English word yanen, an alteration of yonen, or yenen, which in turn comes from the Old English geonian. Pandiculation is the term for the act of stretching and yawning. Yawning is a powerful non-verbal message with several possible meanings, depending on the circumstances. It is also claimed to help increase the state of alertness of a person. The exact causes of yawning are still unknown.
Source(s):
Wikipedia, the free encyclopedia

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what is there to a yawn.and is it really contageouus?

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