O₂-rich air (in)
CO₂-rich air (out)
·
breathing
Reduced-motion mode: showing the labelled airway as a still diagram.
▶ Play
⟲ Reset
🏷️ Labels: on
🐢
🐇
Press ▶ Play and follow the air in and out — it turns blue at the
alveoli
where O₂ is swapped for CO₂.