Muscle Contraction


source: http://www.youtube.com/watch?v=WRxsOMenNQM&feature=BF&list=QL&index=2


source: http://www.youtube.com/watch?v=EdHzKYDxrKc&feature=BF&list=QL&index=2


source: http://www.youtube.com/watch?v=InIha7bCTjM&feature=BF&list=QL&index=2

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