The analysis of the experimental report on the regulation of respiratory movement is to increase the concentration of CO2 in the inhaled air of rabbits, and the increase of CO2 concentration can strengthen respiratory movement. CO2 is the most important physiological factor to regulate respiratory movement, which not only has a strong effect on respiration, but also is necessary to maintain the normal excitement of the respiratory center in the medulla oblongata.

when the Pco2 in inhaled air increases, the alveolar air and arterial blood increase, so breathing deepens and accelerates, and lung flux increases. If the content of CO2 in inhaled air exceeds a certain level, the lung flux can't be increased correspondingly, so that the alveolar gas and arterial blood Pco2 will be increased, which will lead to the activities of the central nervous system, including the respiratory center, and cause dyspnea, headache, dizziness and even coma.

Regulation of respiratory movement

In the experiment of mild hypoxia, Po2 in inhaled air decreased, so did Po2 in alveolar air and arterial blood, so respiratory movement deepened and accelerated. Increased pulmonary ventilation. The direct effect of O2 deficiency on respiratory center is inhibition, which is gradually strengthened with the deepening of O2 deficiency. Therefore, the degree of O2 deficiency is different, and its performance is different.

In mild O2 deficiency, the transmission impulse through peripheral chemoreceptors such as carotid body excites the respiratory center more than the direct inhibition of O2 deficiency on the respiratory center, showing enhanced respiration. If there is severe hypoxia, if the reflex effect of peripheral chemoreceptors is not enough to overcome the direct inhibition of hypoxia, it will lead to the inhibition of respiratory movement.