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It hurts because there are "nerve receptors" at the end of your knee, and when you bump or scrape your knee, the nerve endings send a "signal" to your brain saying, "STOP THAT IT HURTS!" so therefore you basically experience pain.

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16y ago

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Will it hurt to swim with a scraped knee?

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When was Cowards Bend the Knee created?

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How do you use scraped in a sentence?

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