Answer
Medulla oblongata
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The medulla oblongata is a part of the brain called the brainstem and is where the impulses controlling breathing originate. Although we can control our breathing to a great extent, respiration is pretty much involuntary because we do not have to think of when to breathe. The medulla oblongata and certain large blood vessels contain special sensory neurons that detect the amount of carbon dioxide in blood and initiate the breathing reflex.
