K-5 friendly lesson
Try one idea, then jump into the activity.These lessons are designed to feel short, friendly, and easy to follow.
Lungs and Breathing
Inhale oxygen, exhale carbon dioxide.
Lesson 2
Concept
Air travels from your nose/mouth down the windpipe into the lungs. Tiny air sacs swap gases: oxygen in, carbon dioxide out.
Short Answer
Why do you breathe faster after running?
Air Path
Nose/Mouth
→Windpipe (Trachea)
→Lungs
→Oxygen in / CO₂ out