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When you touch something hot by accident, your hand yanks away before you even have time to think about it.
Nerves carry these speedy messages between your body and your brain. They work like tiny wires stretched throughout your body, zapping signals to your brain and back faster than you can blink.
Bones give your body its shape, and hair helps protect skin, but neither one carries messages anywhere, so they can't be responsible for that lightning-fast reaction.
For very fast reflexes, like pulling away from something hot, the signal loops through your spinal cord and back to your muscles first, which is why you react before you even feel the pain.
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