Mon Prof Augmenté
Breathing In
Age 13 · Biology
When you breathe in, the diaphragm pulls flat and the ribs swing up and out. That makes more room in the chest, so the pressure drops and air rushes down into the lungs.
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Age 13: open this week
Browse Age 13
In the picture
- Diaphragm muscle, drawn flat and lowered beneath the lungs
- Ribs tilted upward and outward
- Lung tissue filled and expanded inside the rib cage
- Air moving down the windpipe toward the lungs
Examples
- Your chest and belly rise when you take a slow deep breath before diving into a pool.
- A trumpet player’s ribs lift as they fill up with air before a long note.
Key takeaways
- Air flows into the lungs when the chest gets bigger and the pressure inside falls.
- The diaphragm and the ribs move together every time you breathe in.
Quiz: Breathing In (Age 13)
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When you breathe in, what happens to the ribs?
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Why does air flow into the lungs when you breathe in?
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What do the diaphragm and ribs do every time you breathe in?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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