why do we yawn when we are sleepy or drowsy?

why do we yawn when we are sleepy or drowsy?
One is that when we are bored or tired, we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.
Full answer in: kidshealth.org
Is yawning a sign of lack of oxygen?
In addition, different regions of the brain control yawning and breathing. Still, low oxygen levels in the paraventricular nucleus (PVN) of the hypothalamus of the brain can induce yawning. Another hypothesis is that we yawn because we are tired or bored. Mar 20, 2002
Is yawning a sign of sleepiness?
What is a yawn ? Yawning is a mostly involuntary process of opening the mouth and breathing in deeply, filling the lungs with air. It's a very natural response to being tired. In fact, yawning is usually triggered by sleepiness or fatigue.
Full answer in: www.healthline.com
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Why do we yawn when we are sleepy or drowsy for Class 7?
When we are sleepy or feel drowsy, we yawn because our brain cells lack sufficient amount of oxygen. The deep breath associated with yawning helps us to drawn in more oxygen and supply the much needed oxygen to the tired body organs including the brain..
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Why does yawning happen?
When you start to yawn, powerful stretching of the jaw increases blood flow in the neck, face, and head. The deep intake of breath during a yawn forces downward flow of spinal fluid and blood from the brain. Cool air breathed into the mouth cools these fluids. Sep 23, 2011
Full answer in: www.webmd.com
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