Content protected from screenshots
GKFix.in
General Knowledge
Categories
Concept Builder Quiz
About Us
Start Quiz
Home
My Profile
General Knowledge
Categories
Concept Builder
Start Quiz
Logout
GKFix MCQ Question
Test your knowledge and learn something new
Home
Human Physiology
Question #19973
Back to Home
View All Human Physiology Questions
56 Views
Question
Why do we yawn when sleepy or tired?
A. To show tiredness
B. To stretch facial muscles
C. To communicate
D. To increase oxygen intake
Check Answer
Share on Twitter
Share on Facebook
Copy Link
Related Questions
What happens to the thoracic volume during expiration?
68
In which direction does carbon dioxide move during gas exchange at the tissue level?
46
Which structure ensures that the airway remains open during breathing?
46