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The Respiratory SystemAnatomy & function, explained

Upper Tract Lower Tract Lungs Functions Diseases Glossary

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The Respiratory System

Clear, illustrated guides to every part of the human respiratory system, from the nostrils to the alveoli. Written and illustrated by our own editorial team.

For education only. Not medical advice.

Upper tract

Nose
Nasal cavity
Paranasal sinuses
Pharynx
Larynx
Epiglottis

Lower tract

Trachea
Bronchi
Bronchioles
Alveoli
Lungs
Diaphragm

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© 2026 The Respiratory System. All text, diagrams and illustrations are our own.