next time you're in a meeting, try this little experiment: Take a big yawn, cover you're mouth out of courtesy, watch and see how many people yawn . There's a good chance that you will set off a chain reaction of yawn. Before you finish reading this question of the day, it's likely that you will yawn at least once. don't missunderstand , we aren't intending to bore you , but just reading about yawning will make you yawn, just as hearing or seeing someone else yawn makes us yawn.what's behind this mysterious epidemic of yawning? First, let's look at what a yawn is. Yawning is an involuntary action that causes us to upun our mouths wide and breathe in deeply. We know it's involuntary because we do it even before we are born. Research shows that 11-week-old fetuses yawn.
There are many parts of the body that are in action when you yawn. First, your mouth opens and jaw drops, allowing as much air to be taken in as possible. When you inhale, the air takenin is filling your lungs. Your abdominal muscles flex and your diaphragm is pushed down. the air you breathe in expands the lungs to capacity and then some of the air is blown back out.
The everage yawn lasts about six seconds. During a yawn heart rate can rise as much as 30 percent. Another fact is 55 percent of people will yawn within five minutes of seeing someone else yawn. Blind people yawn more after hearing an audio tape of people yawning. olympic athlethes often yawn before competition. Even reading about yawning will make you yawn. Some interisting yawning facts, aren't they?
