The most important factor that regulates breathing activity is the ____.
A)amount of oxygen in the blood
B)amount of carbon dioxide in the blood
C)amount of oxygen in the air we breath
D)the acidity of the blood
E)chemoreceptors in the blood

Question

The most important factor that regulates breathing activity is the ____. ​
A)amount of oxygen in the blood
B)amount of carbon dioxide in the blood
C)amount of oxygen in the air we breath
D)the acidity of the blood
E)chemoreceptors in the blood ​

Quizplus · Accepted Answer

Breathing is regulated by the amount of carbon dioxide in the blood, as increased levels of carbon dioxide lead to a decrease in blood pH, which is detected by chemoreceptors in the brain and triggers an increase in breathing rate to remove excess carbon dioxide and restore pH balance. The other factors listed can also affect breathing, but to a lesser extent.

The Most Important Factor That Regulates Breathing Activity Is the ____