What Causes Cramps?

Have you ever woken up in the middle of the night with a charley horse in your leg? What's actually going on inside your body?

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Sources:
http://www.medicinenet.com/muscle_spasms/page5.htm
http://www.pbs.org/wgbh/nova/body/our-ability-to-walk.html
http://health.howstuffworks.com/human-body/systems/musculoskeletal/muscle3.htm

Видео What Causes Cramps? канала Life Noggin