Yawns or oscitations occur most often when the body is tired, or an individual is bored. In addition to the involuntary deep inhale and wide mouth opening, yawning causes the Eustachian tubes in the ears that regular pressure to open and close. Excessive yawning occurs for many reasons, some of them trivial and even amusing. In other instances, yawning can indicate medical issues.
The normal rate of breathing or respiratory rate for adults is five to 15 breaths per minute. Modern society seems to encourage almost double the physiological norm, which means the body loses a lot of carbon dioxide. This can cause spasms of the arteries and depletes the amount of oxygen present in the brain and cells of the body. This lack of oxygen in the body can lead to an increased need to breathe deeply.
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