The percentage of oxygen in the atmosphere 20.95% if dropped to less than 13%, the breathing will increase the speed and depth and so increase the amount of oxygen in the pulmonary alveoli, pushing the amount of CO2 Alveoli decreases the depth of breathing for a short period before returning a deep breath because of carbon dioxide combines seconds, and so changed the depth of breathing alternately increases and decreases, and called breathing then alternating periodic breathing. The high proportion ofCO2 In the blood occurs during respiratory cessation At the same time decrease the concentration of oxygen in the blood, centers Vttenbh breathing brain and cause increasing the depth of breathing and speed, spoke of "increased ventilation" Because of this increase the proportion of oxygen and decreases the CO2 concentration In blood And disappears alert brain respiratory centers goes back Second case endowment respiratory This type of breathing is called respiration Shane Stoll, a periodic breathing alternately shows the seriousness of the condition of the person, and occurs in upland areas. If increased pressure molecular oxygen in the air of the atmosphere it will happen Tkherisat in lung tissue, so should not be breathing person Oxgina pure for a period of more than a few hours but it is possible to breathe a gas mixture consisting of 60% oxygen and 40% for a long time without cause health damage.
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respiratory device