Breathing is primarily regulated by ________.
A) erythropoietin levels in the blood
B) the concentration of red blood cells
C) hemoglobin levels in the blood
D) carbon dioxide concentration and pH sensors
E) the lungs and the larynx

Question

Quizplus · Accepted Answer

Breathing is primarily regulated by carbon dioxide concentration and pH sensors. When the carbon dioxide level in the blood rises, it causes the blood pH to decrease, which is detected by chemoreceptors in the brainstem. This triggers an increase in breathing rate and depth, allowing more carbon dioxide to be expelled and pH to be restored to normal levels.

Breathing Is Primarily Regulated by ________