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Respiration is normally an automatically performed procedure. So that you can sleep comfortably with out ever bothering about taking and giving out the air from the lungs. You can not control the heart beats. But you can control the respiration. So when you see the smoke you can stop the respiration for some time. You can stop the respiration for some time, when you are under the water. You can go for the yoga procedure called as "pranayama". Here you can sustain the life with single breath per minute. You can continue to do this for hour or two. All this voluntary regulation of the respiration is done by your cerebral cortex. This means the cerebral cortex has got direct control over the respiratory centre. But this control is not absolute. Nobody has ever died of voluntarily stopping the respiration. The increased pH of the blood is most powerful stimulant of the respiration.

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10y ago

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