Lungs and Breathing
⭐ MasteredWhen you breathe in, your lungs take in oxygen. Oxygen passes into your blood and carbon dioxide leaves when you breathe out.
You breathe about 20,000 times a day.
All about Lungs and Breathing
Breathing brings oxygen into your body and removes carbon dioxide. When you breathe in, your diaphragm and rib muscles expand your chest, and air rushes into your lungs through your nose or mouth and windpipe.
In the lungs, oxygen passes through tiny air sacs called alveoli into your blood. The blood carries it around your body. When you breathe out, your lungs push carbon dioxide out. An average child breathes around 15 to 20 times every minute when resting.
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Real-life uses of Lungs and Breathing
- Supplying oxygen to your muscles when you run
- Helping you speak, sing and laugh
- Learning to breathe slowly to calm down
Frequently asked questions about Lungs and Breathing
Why do we breathe faster when we exercise?
Muscles need more oxygen when working hard, so your body breathes faster to get more into your blood.
What happens to the air we breathe out?
It contains more carbon dioxide and less oxygen than the air we breathe in, and it has water vapour in it.
Why do we have two lungs?
Two lungs give your body a large surface area for exchanging gases and allow the heart to fit between them.