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
28 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
Which part of the bronchial tree lacks cartilage in its walls?
24
Which hormones are known as emergency hormones and why?
39
What does Chapter 17 describe?
34