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
Table of Contents
1) Cardiac, Smooth,
آی-ویدئو