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Topics | Brain and Nervous System | Healthy Nervous System | Functions of Nerves | What does the vagus nerve do? The vagus nerve provides a speedy line of information to the brain from the gut, where battles with bacteria and viruses are continually raging. Knowledge of the vagus's role was a mystery until very recently, but we now know that you can learn about your body from your vagus. The longest nerve directly from the brain, the vagus sends messages to and receives messages from your gut and every other organ in your body. Because 85 percent of this huge nerve carries information back to the brain, it's the main mechanism by which your brain audits your body. The remaining 15 percent takes information from your brain to your body.
The vagus nerve is the lifeline between the vital function control centers of your brain and your visceral organs, passing messages constantly between your hypothalamus and organs to control things like pulse and respiration, certain secretions, and the limiting of immune response. Inflammation: What role does the vagus nerve play?