Why we yarn

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Why we yarn

Posted by Pragya Roy 6 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

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. Certain conditions can cause a vasovagal reaction, which results in excessive yawning. Some evidence suggests that yawning is a means of communicating changing environmental or internal body conditions to others. 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.

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