A deep prolonged breath that fills the lungs believed to be caused by the need to increase the level of oxygen in the blood is called yawning.
Yawning is the phenomenon of opening one's mouth wide apart, inhaling large quantities of air inside, followed by short exhaling. There are several reason put forward for yawning. Some of these include boredom, sleepiness, tiredness, and also low levels of oxygen. It is believed that hypothalamus region is responsible for inducing yawn when the oxygen levels are low.
Breath can be defined as the air inhaled or exhaled during the process of breathing. Breath inhaled is the air taken inside the lungs and breath exhaled is the amount of air released by the lungs to the outer environment.
To know more about yawning, here
brainly.com/question/10715112
#SPJ4
