Mon Prof Augmenté
Giraffe Bending to Drink
A giraffe lowers its long neck to a pool. Special neck arteries and one-way valves keep blood moving to its head so it does not faint.
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 12, 2026: its text stays readable here, and its picture opens with a subscription.
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Age 12: open this week
Browse Age 12
In the picture
- Heart in the chest cutaway
- Lower neck artery
- One-way valve inside the artery
- Upper neck artery
Examples
- Your veins have one-way valves that help blood move from your feet back to your heart.
- A one-way gate lets people leave a stadium but stops them from going back in.
Key takeaways
- Giraffes have special neck arteries that reduce blood pressure when the head is low.
- One-way valves keep blood moving upward instead of slipping back down.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
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