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It was once believed that the main function of yawning was to increase otherwise low oxygen levels, but a 1987 study disproved that theory. And despite extensive additional research on yawning ...
The yawn reflex has long been observed to be contagious. In 1508, Erasmus wrote, "One man's yawning makes another yawn", [39] and the French proverbialized the idea to "Un bon bâilleur en fait bâiller sept" ('One good gaper makes seven others gape'). [40] Often, if one person yawns, this may cause another person to "empathetically" yawn. [23]
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Merely thinking about or seeing someone yawning can make you yawn. But why?
For example, at high altitude, the arterial oxygen P a O 2 is low, but only because the alveolar oxygen P A O 2 is also low. However, in states of ventilation perfusion mismatch , such as pulmonary embolism or right-to-left shunt , oxygen is not effectively transferred from the alveoli to the blood which results in an elevated A-a gradient.
Possible causes include cerebral ischemia, hypoxia (inadequate oxygen supply to tissue), or anoxia (total oxygen depletion). Agonal breathing is a severe medical sign requiring immediate medical attention, as the condition generally progresses to complete apnea and preludes death. The duration of agonal respiration can range from two breaths to ...