What part of the brain controls ventilation?

• A. Medulla
• B. Cerebellum
• C. Pons
• D. Hypothalamus

Answer: (B)

Ventilation is controlled by brainstem circuits that set the breathing rhythm. The medulla oblongata houses the main respiratory centers—the dorsal respiratory group drives inspiration and the ventral respiratory group provides active expiration. They respond to chemical signals like CO2, O2, and pH through central and peripheral chemoreceptors, adjusting how fast and how deeply you breathe. The pons helps fine-tune this rhythm, shaping transitions between inhalation and exhalation, but the medulla is the primary generator of the breathing pattern. The cerebellum handles coordination of movement and balance, not the drive to breathe. The hypothalamus can influence breathing indirectly during emotional or temperature changes, but it doesn’t set the rhythm itself. So, the medulla oblongata is the key control center for ventilation.