Whenever we feel drowsy or sleepy we start yawning

cbse
cbse-class-7-science
respiration-organism

#1

Whenever we feel drowsy or sleepy we start yawning. Does yawning help us in anyway?
Answer:
During drowsiness, our breathing rate slows down. The lungs do not get enough oxygen from the air resulting in yawning. Yawning brings extra oxygen into the lungs and helps us to keep awake.