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[mathan...@gmail.com]

Hi,

I have a question about what is happening in this video at 00:30:47 -

http://www.youtube.com/watch?v=gLVD1RJyIt4#t=1847s.

greatest effect on force produced by a myofibril is.

Thanks!

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Reference Key - ahlqfnN3YXlhbS1ub2RlMS1wcm9kdWN0aW9uciILEhVTdHVkZW50UXVlc3Rpb25FbnRpdHkYgIDAxfCKsgkMogENbnNfbm9jMTlfZ2UyOA

[swarnab.d...@gmail.com]

Hello.
That part of the video explains how in presence of ATP(hydrolysis of ATP to ADP), the troponin-tropomyosin complex undergoes a conformational change thus exposing the actin binding sites for the Myosin heads to attach.(The binding sites were previously unexposed). This attachment initiates the cross-bridge cycle for force production in the sarcomere.

Please explain the context of the second part of your question.