Q:

Why do we yawn

Answer

Our bodies induce yawning to draw in more oxygen or remove carbon dioxide build-up. Research shows that 11-week old fetuses yawn.

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More ChaCha Answers (4)

We yawn because it helps us bring more oxygen into the blood and move more carbon dioxide out of the blood. ChaCha!

Aug 24 2009, 01:38am | Source: Why Do I Yawn? | kidshealth.org

The most plausible explanation is that we yawn because oxygen levels in our lungs are low. ChaCha on!

Aug 15 2009, 02:01am | Source: Little mystery: Why do we yawn? - Other - MSNBC.com | www.msnbc.msn.com

A plausible explanation, and the one that is taught in medical school, is that we yawn because oxygen levels in our lungs are low.

Mar 28 2009, 12:35pm | Source: Little mystery: Why do we yawn? - Other - MSNBC.com | www.msnbc.msn.com

We yawn due to a lack of oxygen.

Mar 28 2009, 05:41am | Source: WordNet Search - 3.0 | wordnet.princeton.edu
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