Big Guns: The Muscular System - CrashCourse Biology #31
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Big Guns: The Muscular System - CrashCourse Biology #31
Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax. Crash Course Biology is now available on DVD! http://dft.ba/ 8bCC Like CrashCourse: http://www.facebook.com/YouTubeCrashCourse Follow CrashCourse: http://www.twitter.com/TheCrashCourse
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