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  2. Why you yawn when you’re bored, according to experts - AOL

    www.aol.com/lifestyle/why-yawn-bored-according...

    It was once believed that the main function of yawning was to increase otherwise low oxygen levels, but a 1987 study disproved that theory. And despite extensive additional research on yawning ...

  3. Why do we yawn — and why is it so contagious? Experts explain.

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  4. Yawn - Wikipedia

    en.wikipedia.org/wiki/Yawn

    Dogs demonstrate contagious yawning when exposed to human yawning. Dogs are very adept at reading human communication actions, so it is unclear if this phenomenon is rooted in evolutionary history or a result of domestication. [67] Fish can also yawn, and they will increase this behavior when experiencing a lack of oxygen. [68]

  5. Why do we yawn — and why is it so contagious? Experts explain.

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  6. Effects of high altitude on humans - Wikipedia

    en.wikipedia.org/wiki/Effects_of_high_altitude...

    The effects of high altitude on humans are mostly the consequences of reduced partial pressure of oxygen in the atmosphere. The medical problems that are direct consequence of high altitude are caused by the low inspired partial pressure of oxygen, which is caused by the reduced atmospheric pressure, and the constant gas fraction of oxygen in ...

  7. Exhalation - Wikipedia

    en.wikipedia.org/wiki/Exhalation

    Yawning is a reflex that tends to disrupt the normal breathing rhythm and is believed to be contagious as well. [14] The reason why we yawn is unknown. A common belief is that yawns are a way to regulate the body's levels of O 2 and CO 2, but studies done in a controlled environment with different levels of O 2 and CO 2 have disproved that ...

  8. Yawning is more contagious for the young, study says - AOL

    www.aol.com/news/2014-03-17-yawning-is-more...

    Yawning. We all do it and yet there's no set explanation on why we do it. And just as mysterious is that the act of yawning seems to be contagious. A new study looking at that issue has found that ...

  9. Hypoxic ventilatory response - Wikipedia

    en.wikipedia.org/wiki/Hypoxic_ventilatory_response

    The process is induced by a decrease in oxygen partial pressure in blood. Type I glomus cells of carotid bodies detect the change in oxygen levels and release neurotransmitters towards the carotid sinus nerve, which in turn stimulates the brain, ultimately resulting in increased ventilation. [2]