Anatomy Category

Lungs & Breathing

How you turn air into life. The respiratory system, the lungs and the elegant exchange of oxygen for carbon dioxide.

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Guides

Guides in Lungs & Breathing

Start with any guide below — each one is written for beginners and builds on the last.

Every breath is a chemistry exchange. How air travels from nose to alveoli and how oxygen swaps places with carbon…

Two spongy organs with the surface area of a tennis court. How the lungs are structured and how breathing is controlled…

Practice

Reinforce what you learn with these interactive tools.

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Browse all major body systems in one place and jump to the organs and guides for each.

Test your knowledge of the human body with an adaptive multiple-choice quiz and instant, explained feedback.

A searchable, plain-language glossary of the anatomy terms used across the site.

Every part of the body connects to the rest. Browse all nine categories and keep exploring.

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