Have you ever felt tiny bumps pop up on your arm when you're cold, scared, or hear an amazing song?
Those little bumps are called goosebumps. In this lesson you'll find out what they really are, why they happen, and the surprising reason your body still makes them today!
Tap Next to begin your body adventure. 🔎
Each hair on your skin has a tiny helper hiding underneath. Tap each glowing spot to discover the parts.
That tiny muscle has a big name: the arrector pili (say: a-REK-tor PY-lie).
When your body gets a signal, this muscle squeezes tight. It tugs on the hair root, and…
👉 the hair stands up straight, and the skin around it puffs into a little bump. That's a goosebump!
It's a bit like pulling a tent rope — the ground bunches up where the rope pulls. ⛺
Pick something that gives people goosebumps and watch the arm react. Can you make all the little hairs stand up?
Here's the surprise: goosebumps were super useful for furry animals long ago!
Puffed-up fur traps warm air to keep an animal cosy in the cold. And standing-up fur makes a scared animal look bigger to enemies!
We don't have thick fur anymore, so our goosebumps don't do much now — but our bodies still make them out of habit. 🧬
Tap Yes or No for each one. Think about cold, strong feelings, or big excitement.
When you get a goosebump, which part is doing the work? Tap your answer.
Look at everything you now know:
Next time you get goosebumps, you'll know exactly what your amazing body is doing. Great work! 🎉