Fake lungs!

The medulla oblongata begins the process of inhalation and inspiration. The medulla oblongata controls breathing in one's body by sending signals to the diaphragm and intercostal muscles. Upon inhalation, the diaphragm lowers and the intercostal muscles contract. The ribs then move up and out. Exhalation occurs when alveoli stretch receptors fill up with air. When filled up with air, the stretch receptors send signals to the medulla oblongata and the oblongata then stops the stimulation of the diaphragm and intercostal muscles. This cause them to relax. The process of inhalation requires the diaphragm to contract. The negative pressure on the chest cavity due to increased volume cause the air to rush in.