Solution: The respiratory rhythm center in the medulla area of the brain is in charge of controlling the breathing process. The pneumatic center can change the function of the respiratory rhythm center by sending signals to lessen the rate of inspiration. Hydrogen ions and carbon dioxide are sensitive in the chemosensitive area near the respiratory center. To remove chemicals, this area provides signals to change the rate of expiration. The carotid artery and the aorta have receptors that sense the quantities of carbon dioxide and hydrogen ions in the blood. The respiratory center sends nerve signals for ventilation as the carbon dioxide level rises.