Breathing is regulated unconsciously by center in the brainstem. These centers adjust the rate and rhythm of breathing according to changes in the composition of the blood, especially the concentration of carbon dioxide.

呼吸受到脑干中心无意识的调节。这些中心根据血液成分的变化，特别是二氧化碳的浓度来调节呼吸的速度和节律。