why do we yawn?......?

Question

what are the scientific reasons behind yawning?

Answer 1

scientific reason i don't know but i yawn when i really bore by our teacher's lecture ?????????/

Answer 2

The fact about why people yawn is not yet a clear but there is an explanation that when people sit in closed spaces, the oxygen content in the air will reduce and body starts demanding some extra oxygen and that is why we yawn taking inside lot of air.

Answer 3

THE TRUTH IS that we don’t completely understand why people, or animals for that matter, yawn.

It’s widely assumed that yawning occurs because we are tired or bored or because we see someone else doing it, but there isn’t any hard evidence to support these beliefs.

Scientists do not purport to know all of the biological mechanisms of the yawn, but tend to agree that a yawn is an involuntary respiratory reflex, which regulates the carbon dioxide and oxygen levels in the blood.

Technically, a yawn is the reflex opening of the mouth followed by the deep inhalation and slow exhalation of oxygen.

The very act of yawning is but one of a number of involuntary reflexes controlled by the spinal and nerve centers.

Scientists speculate that the onset of a yawn is triggered either by fatigue, or by sheer boredom as, at those times, breathing is shallow, and little oxygen is carried to the lungs by the oxygen-toting cardiovascular system.

When one yawns, his or her alertness is heightened, as the sudden intake of oxygen increases the heart rate, rids the lungs and the bloodstream of the carbon dioxide buildup, and forces oxygen through blood vessels in the brain, while restoring normal breathing and ventilating the lungs.

This quite plausible theory of yawning falls short of explaining many aspects of yawning. Scientists explain away the "contagious" nature of yawning, that is when one person's yawn triggers another nearby to yawn, as due to the power of suggestion, but are at a loss when attempting to explain why yawning occurs excessively in patients with lower brainstem damage or with multiple sclerosis.

Other unlocked mysteries include why fetuses in the womb yawn, when it is a well-known fact that they do not intake oxygen into their lungs until after live birth, or why individuals with high concentrations of oxygen in their blood streams yawn.

Until these questions are answered, do not assume that a person who yawns in your presence is bored with what you are saying, or suffers from exhaustion. Simply be pleased that he or she is not bored to death.

Answer 4

THE TRUTH IS that we don’t completely understand why people, or animals for that matter, yawn.

It’s widely assumed that yawning occurs because we are tired or bored or because we see someone else doing it, but there isn’t any hard evidence to support these beliefs.

Scientists do not purport to know all of the biological mechanisms of the yawn, but tend to agree that a yawn is an involuntary respiratory reflex, which regulates the carbon dioxide and oxygen levels in the blood.

Technically, a yawn is the reflex opening of the mouth followed by the deep inhalation and slow exhalation of oxygen.

The very act of yawning is but one of a number of involuntary reflexes controlled by the spinal and nerve centers.

Scientists speculate that the onset of a yawn is triggered either by fatigue, or by sheer boredom as, at those times, breathing is shallow, and little oxygen is carried to the lungs by the oxygen-toting cardiovascular system.

When one yawns, his or her alertness is heightened, as the sudden intake of oxygen increases the heart rate, rids the lungs and the bloodstream of the carbon dioxide buildup, and forces oxygen through blood vessels in the brain, while restoring normal breathing and ventilating the lungs.

This quite plausible theory of yawning falls short of explaining many aspects of yawning. Scientists explain away the "contagious" nature of yawning, that is when one person's yawn triggers another nearby to yawn, as due to the power of suggestion, but are at a loss when attempting to explain why yawning occurs excessively in patients with lower brainstem damage or with multiple sclerosis.

Other unlocked mysteries include why fetuses in the womb yawn, when it is a well-known fact that they do not intake oxygen into their lungs until after live birth, or why individuals with high concentrations of oxygen in their blood streams yawn.

Until these questions are answered, do not assume that a person who yawns in your presence is bored with what you are saying, or suffers from exhaustion. Simply be pleased that he or she is not bored to death.

Answer 5

Because some of the questions on this site are so boring.

Also, scientists haven't worked out why we, and other animals, yawn. However, it isn't to increase the oxygen to our brain, as most people might think, it is more likely a hormonal release to help keep us awake (clearly doesn't always work).

Answer 6

To inhale additional quantity of oxygen.When you are tired or when in environment oxygen content is less or if somebody yawns(Means exhales carbon di oxide) you yawn.

Answer 7

As there is less quantity of oxygen in the brain if we yawn the oxygen is filled in the brain.

Answer 8

because theres too much carbon dioxide in our body...thats the reason why people yawn...anyways we breathe not because the body cells require oxygen..we breathe because of the increasing amounts of carbon dioxide resulting from tissue respiration etc... :)) yawning is one of the ways the body removes the carbon dioxide at a faster rate...just like panting

Answer 9

It is natures arrangement .
We feel like yawning when the body needs more oxigen for the purpose unknown to the yawner sometimes.

Answer 10

It is physiological requirement of teh body, which requires more oxygen at that time. When we yawn, more air get into our lungs, thus fulfilling our oxygen demand.