Here's what happens to your knuckles when you crack them

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Here's what happens to your knuckles when you crack them

There's a space in your joints filled with synovial fluid, a liquid that reduces the friction in your joints when you move. It contains gases (oxygen, nitrogen, and carbon dioxide).

When you pop a joint, you stretch out that space between the bones. That expanding space creates negative pressure, like a vacuum, that sucks in the synovial fluid. It forms bubbles, which then collapse, and that's what you hear.

Here's what happens to your knuckles when you crack them


Source: Vox via ScienceDump

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Thinking Humanity: Here's what happens to your knuckles when you crack them
Here's what happens to your knuckles when you crack them
There's a space in your joints filled with synovial fluid, a liquid that reduces the friction in your joints when you move. It contains gases (oxygen, nitrogen, and carbon dioxide).
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Thinking Humanity
https://www.thinkinghumanity.com/2015/04/heres-what-happens-to-your-knuckles-when-you-crack-them.html
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