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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 ...
Yawning may reduce oxygen intake compared to normal respiration; [23] however, the frequency of yawning is not decreased by providing more oxygen or reducing carbon dioxide in the air. [ 24 ] Animals subject to predation or other dangers must be ready to physically exert themselves at any given moment.
Merely thinking about or seeing someone yawning can make you yawn. But why?
Yawning is a reflex that tends to disrupt the normal breathing rhythm and is believed to be contagious as well. [14] The reason why we yawn is unknown. A common belief is that yawns are a way to regulate the body's levels of O 2 and CO 2, but studies done in a controlled environment with different levels of O 2 and CO 2 have disproved that ...
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Hypoxemic hypoxia is a lack of oxygen caused by low oxygen tension in the arterial blood, due to the inability of the lungs to sufficiently oxygenate the blood. Causes include hypoventilation, impaired alveolar diffusion, and pulmonary shunting. [8] This definition overlaps considerably with that of hypoxic hypoxia.
Tissue hypoxia refers to low levels of oxygen in the tissues of the body and the term hypoxia is a general term for low levels of oxygen. [2] Hypoxemia is usually caused by pulmonary disease whereas tissue oxygenation requires additionally adequate circulation of blood and perfusion of tissue to meet metabolic demands.
When scientists increased the excitability by using external transcranial magnetic stimulation, the contagious yawning also increased. So why is this important? After all it’s just a yawn right.
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