Imagine your knee is like a spring, when something taps it, it bounces back. That's the knee-jerk reaction! It happens because of nerves in your leg that send messages super fast to your brain and then right back down to make your leg kick automatically, without you even thinking about it.
Examples
- When a doctor taps your knee during a checkup, your leg kicks out automatically.
- You could feel your leg jump if someone suddenly hits your knee with a ruler.
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See also
- What are deep tendon reflexes?
- What are reflexes?
- What is Areflexia?
- Why Do Humans Get 'Brain Freeze'?
- What is Guillain-Barré syndrome?