K-5 friendly lesson
One small step at a time.Read the idea, try the activity, and celebrate each win as you go.
Lungs and Breathing
Inhale oxygen, exhale carbon dioxide.
Do this: Read the concept below, then try the quiz or activity.
Lesson 8 of 18
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