Answers

2015-09-21T21:12:40+05:30
We do think that yawning is for sleeplessness but actually it is not it for a long breath. when we need a large amount of oxygen we just yawn. the scientific reason for yawing is when do not take long breath we automatically yawn.
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  • Brainly User
2015-09-21T21:17:40+05:30
Answer=When we are tired,our lungs and the rest of the respiratory system slows down until there is too little air in our lungs.Our body then sets off a spasm (a quick movement) in the muscles of our mouth.throat and chest.This forces us to take a deep breath of air (yawn) to take in more air.
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