Breathing is Usually Regulated By

Question

Breathing is usually regulated by
A) erythropoietin levels in the blood.
B) the concentration of red blood cells.
C) hemoglobin levels in the blood.
D) CO₂ and O₂ concentration and pH-level sensors.
E) the lungs and the larynx.

Accepted Answer

Breathing is regulated by sensors in the brain that detect changes in CO₂ and O₂ levels, as well as changes in pH levels. These sensors signal the respiratory muscles to adjust the rate and depth of breathing in order to maintain proper gas exchange in the body. Other factors, such as activity level and emotions, can also influence breathing. However, erythropoietin, red blood cell concentration, hemoglobin levels, the lungs, and the larynx do not directly regulate breathing.