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Heart, vessels and lungs at work
Age 13 · Biology
Open to everyone until Friday, November 13
To keep it, print it while it is open.
When you run, your muscles need much more oxygen and fuel, so your lungs and heart work harder. The heart pumps blood around a loop of vessels that delivers supplies to the muscles and carries waste back.
In the picture
- Lungs: take in oxygen and release carbon dioxide
- Heart: pumps blood faster and harder
- Arteries: carry oxygen-rich blood to the muscles
- Muscles: use oxygen and nutrients, then veins carry the blood back
Examples
- Your breathing and pulse speed up when you sprint for the bus.
- After a football match your chest feels like it is pounding and you are out of breath.
Key takeaways
- Blood is the delivery system: it carries oxygen and nutrients to muscles and takes waste away.
- During exercise the heart beats faster and breathing gets deeper to meet the muscles' needs.
Quiz: Heart, vessels and lungs at work (Age 13)
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What is the main job of blood during exercise?
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What happens to your heart and breathing when you run?
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What do the lungs do for the body while you exercise?
The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.
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