Placeholder Image

字幕列表 影片播放

  • Smart Learning for All

  • Why do we yawn?

  • Human beings, including some animals yawn.

  • What?

  • Animals also yawn?

  • Absolutely.

  • During yawning, which is also called oscitation, we take a deep breath of air.

  • Hence, a theory suggested that it helps our body bring in more oxygen and give out carbon dioxide.

  • However, it is incorrect.

  • A prevailing research suggests that yawning regulates our brain's temperature.

  • Our brain works best at certain temperatures.

  • But when we perform various activities throughout the day, our brain gets exhausted and sleep deprived.

  • Both exhaustion and sleep deprivation increase our brain's temperature.

  • Hence, to cool it down, we yawn.

  • While yawning, we stretch our jaw and propel blood through blood vessels to the brain.

  • Along with this, we inhale air through our mouth and nose.

  • Air cools the blood going to the brain which in turn decreases our brain's temperature.

  • For more educational videos please visit http://www.SmartLearningforAll.com

  • Also, don't forget to subscribe to our YouTube channel.

Smart Learning for All

字幕與單字

單字即點即查 點擊單字可以查詢單字解釋

B1 中級 美國腔

為什麼我們要打哈欠? (Why do we yawn? | #aumsum)

  • 83 7
    AumSum 發佈於 2021 年 01 月 14 日
影片單字