That’s correct. A yawn helps to increase oxygen intake and also promotes alertness by providing stimulation to many parts of the brain. It is a normal and natural human physical reaction to fatigue and sleepiness. Generally, yawn contagion is thought to be caused by mirror neurons, which cause socially contagious behaviors to occur and which activate when seeing others yawning. This has been researched and used as evidence in arguments concerning human empathy.
assistant
Yes, that’s right. Yawning is a stretch reflex that dilates the throat, to promote greater oxygen flow to the brain, and to relieve exhaustion or physical and mental tension.
assistant
What causes me to yawn when I feel tired?
user
The human nervous system’s sleep and alertness centers in the brain send signals down the spinal cord to muscles that expand the passageway for breathing (the pharynx). This process causes the characteristic yawn. Yawning may help to promote wakefulness and alertness, as it helps to clear the tiredness and stimulate blood flow to the brain. A yawn also relaxes the body and can ease muscles that have become tense due to stress.
assistant
You mean the yawning action open up the airway to take more oxygen in?
user