Why do all the animals including humans yawn? Especially while sleepy or while walking up after one. 371 viewsJanuary 1, 2024 Question98.97K April 19, 2023 0 Comments Title says it all… In: 7 14 Answers ActiveNewestOldest Anonymous Posted April 19, 2023 0 Comments If I am not mistaken, a yawn is caused by the increased concentration os CO2 in the blood which triggers a sudden muscular relaxation to force more oxygen into the body to restore the oxygen levels to normal. You are viewing 1 out of 14 answers, click here to view all answers. Register or Login
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