Breathing is controlled by the medulla oblongata. Autonomic nerves from the medulla oblongata to the diaphragm and chest muscles produce the cycles of contraction that bring air into the lungs. Cells in the breathing center monitor the amount of carbon dioxide in the blood. When carbon dioxide levels rise, nerve impulses cause the diaphragm to contract. The higher the carbon dioxide levels the stronger the impulses. If carbon dioxide levels rise to a very high point the impulses are so strong you can not keep from breathing.

How is breathing Controlled?