Body Atlas

Who Controls Your Breathing · Lungs

Why do I feel the urge to breathe?

Rising carbon dioxide, not falling oxygen, drives the urge.

The simple answer

Here's the surprise: the desperate urge to breathe isn't caused by running out of oxygen. It's caused by carbon dioxide building up. Your body watches the waste far more closely than the fuel.

Go deeper

There's more: rising carbon dioxide, not falling oxygen, drives the urge. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

Explore this concept in Body Atlas →

Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy