How Breathing Works
Know that we breathe air into our lungs through the nose and mouth, that our lungs take in oxygen from the air which our body needs to stay alive, and that we breathe out carbon dioxide as waste
What a learner can do afterwards
- Trace the path of air: nose/mouth → windpipe → lungs
- State that lungs take oxygen from the air, which the body needs
- State that we breathe out extra carbon dioxide made by the body
1 · Read
You breathe all the time to stay alive, even when you run and play. Air comes in through your nose or mouth. It moves down a tube called your windpipe to your lungs.
Ben runs fast at recess. Air goes in through his nose, down his windpipe, and into his lungs. His lungs pull oxygen out of the air, and his body needs that oxygen to keep going. Running uses oxygen faster, so Ben needs more of it. That is why he breathes faster when he runs.
Your lungs take in oxygen and remove extra carbon dioxide. Your body makes this waste gas as it uses food for energy. You breathe it out.
Air comes in, lungs take oxygen, and you breathe out carbon dioxide.
The rewritten readings were written for this dataset.
2 · Watch
Take it off screen
Where it sits
Learn first
Nothing; this is a starting point.
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.