How Breathing Works: The Brainstem's Role (Not the Nervous System Directly)

Breathing is automatically controlled by the brainstem—specifically the medulla oblongata and pons—which house the respiratory centers. These centers:

• Generate rhythmic respiratory drive.
• Integrate sensory input (CO₂, O₂, pH) from chemoreceptors.
• Send signals via phrenic and intercostal nerves to respiratory muscles.

While the autonomic nervous system modulates breathing (e.g., during stress), the primary automatic control resides in the brainstem, not the higher nervous system. The lungs themselves are passive structures that respond to pressure changes created by respiratory muscles.