Mon Prof Augmenté
Running Heart and Lungs
When you run, your leg muscles burn through oxygen and fuel much faster than when you sit still. Your heart beats faster and your breaths get deeper so blood can carry the extra oxygen to those muscles.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on September 9, 2026: its text stays readable here, and its picture opens with a subscription.
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Age 15: open this week
Browse Age 15
In the picture
- The heart inside the chest cutaway
- The lung behind and above the heart in the same cutaway
- The bundle of thigh muscle fibres inside the leg cutaway
- The thick blood vessel arcing across the hip from chest to thigh
Examples
- Climbing four flights of stairs leaves you panting and able to feel your pulse in your neck.
- A footballer’s chest heaves after a sprint, then slowly settles during a break in play.
Key takeaways
- Working muscles need more oxygen, so heart rate and breathing rate both rise.
- Deeper breaths load more oxygen into the blood, and a faster heart delivers it sooner.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
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