The explanation that yawns are caused by a lack of O2 in the bloodstream, and that the yawn reflex causes boost of oxygen, is just a hypothesis! It is not accepted scientific fact.
Breaths while yawning are more shallow than a normal deep breath. In fact, you can hold your breath or exhale while yawning (try some simple experimentation during your next yawn).
Modern theory says yawning is either a stretch instinct or some kind of social cue.
Yawning stretches the jaw muscles, which run along the sides of the head and affect the ears. In theory, yawning may be stimulated by nerves in the ear because opening the mouth widely induces pressure changes in the middle ear. It has been suggested that cats, and humans, yawn when awakening from sleep because they have been lying in one position and this has caused uneven pressure in the ears, which yawning can fix.
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Actually, yawning is due to an abundance of CO2… not “not enough oxygen”. Carbon dioxide levels are actually what effect tidal volumes, blood levels, etc… it’s a common misconception.
And when you yawn it’s trying to get more O2 to the blood, when yawning your jaw locks open to permit the maximum amount of air in.
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Breaths while yawning are more shallow than a normal deep breath. In fact, you can hold your breath or exhale while yawning (try some simple experimentation during your next yawn).
Modern theory says yawning is either a stretch instinct or some kind of social cue.
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Are we sure he’s not giggling? Looks to me like he’s having a giggling fit!
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You can hold your breathe and yawn! Thank you for all your kind information.
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well i’m sorry if all the science teachers i’ve ever had are wrong about the cause of yawning. don’t blame me.
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I wonder if cat and people yawn while they are sleeping?
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or maybe it’s just tired.
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@me well i’m terribly sorry, you can just go make your own, accurate, one and not screw with me.
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Some people think it is because ape leaders yawn when it is time for a change.
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lol, right after i read this i yawned. i guess the rumors are true. Yawning IS contagious.
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Actually, yawning is due to an abundance of CO2… not “not enough oxygen”. Carbon dioxide levels are actually what effect tidal volumes, blood levels, etc… it’s a common misconception.
And when you yawn it’s trying to get more O2 to the blood, when yawning your jaw locks open to permit the maximum amount of air in.
Anatomy & Physiology 2
it’s good for the Nurse.
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