Yawning is an involuntary reflex by the body to control the levels of carbon dioxide and oxygen in the blood. The yawn draws more oxygen into the lungs through a deep breath.
Typrically this happens after periods when the oxygen level is low as we have been taking short shallow breaths. This tends to happen when we are bored or fatigued. If we do it when exercise its probable due to the fatigue or just the fact we have been breathing in a restricted way well exercising
by Edmund Custers5 years ago
Sometimes I find myself yawning when people yawn. Why is that? Why do people yawn when tired? After reading this you will probably yawn at least once. Please let us know if you did and/or provide your input on yawning.
by Alistair Olver5 years ago
Why do we yawn?We all do it, but what is the purpose of yawning?
by szufisticada7 years ago
Why do we yawn? is it true that people tend to yawn due to lack of oxygen in the brain?
by Simone Haruko Smith6 years ago
What triggers yawning?There's a theory running around my office that I yawn every time a certain person talks. Could this person's tone of voice, or some other characteristic, be causing me to involuntarily yawn for...
by carolegalassi7 years ago
Why is it that when you yawn your eyes tear up?I often wondered what yawning and tearing eyes have in common. It doesn't make sense. With your mouth wide open, you breath in deeply, filling your lungs with...
by katdiaz20116 years ago
Do you cry/ tear up when you yawn?If so, why does this happen?
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