CBSE Class 10 Answered
What is the scientific reason behind yawning? Why does it occur? Why do we get goosebumps during yawn?
Asked by virenderlathiya | 18 Mar, 2020, 09:32: PM
Expert Answer
- Yawning occurs when we are tired, sleepy or bored.
- We yawn because oxygen levels in our lungs are low. Studies have shown that during normal, at-rest breathing, we do not use anywhere near our lung capacity; for the most part, we just use the air sacs at the bottom of the lungs. If the air sacs, called alveoli, don’t get fresh air, they partially collapse and the lungs stiffen a bit. Also carbon dioxide builds up in the blood. As a result, it’s believed that our brain prompts the body to either sigh or take a yawn to get more air into the lungs.
- Yawning and stretching increase blood pressure and heart rate and also flex muscles and joints.
- Goosebumps occur when we experience a strong emotion such as fear, anxiety and sexual arousal. They occur when the tiny muscle located at the base of each hair follicle contracts, causing the hair to stand on end.
Answered by Sheetal Kolte | 19 Mar, 2020, 11:14: AM
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