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Somehow I haven't found anyone on the internet can answer this: during muscle contraction, does the thin myofilament slide past the stationary thick myofilament, or does the thick myofilament slide past the stationary thin myofilament?

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  • $\begingroup$ think of it this way : the thin filaments are attached to the Z-line(with the help of Z -disc) and thick filaments with the help of a spring like protein(titin). Now, when contraction occurs, myosin head pulls the actin filament towards it (power stroke) : i.e. Z-line is pulled towards the centre and the length of sarcomere shortens. So, actin is pulled towards the centre : Thin filament slide over the thick ones. PS: I'll try to add a detailed ans later on. =) $\endgroup$ Feb 2, 2018 at 17:51

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This is an article on muscle contraction. It'll help to solve your problems. Especially read the part where the information about mechanism of power stroke is given (above figure 11.24). Ask if you have furthur questions after reading this article!

https://www.ncbi.nlm.nih.gov/books/NBK9961/

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thick filaments slide over thin as cross bridges are formed by thin filament which slides thick filament and sandwich like structure is formed and Z-line disappears

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    $\begingroup$ Thank you for answering. Do you have any credible references however? $\endgroup$
    – John Joe
    Jan 31, 2018 at 16:46
  • $\begingroup$ actually i read abou that in my state board textbook of biology $\endgroup$
    – Bhavya
    Feb 1, 2018 at 4:50
  • $\begingroup$ can you reference the textbook then? $\endgroup$
    – John Joe
    Feb 1, 2018 at 9:54
  • $\begingroup$ i already reffered it and wrote answer $\endgroup$
    – Bhavya
    Feb 1, 2018 at 9:58
  • $\begingroup$ That's not a reference, what is the title of the book? Who is the author or publisher? What year was it published? $\endgroup$
    – John Joe
    Feb 2, 2018 at 4:36

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