and another
http://www.youtube.com/watch?v=0kFmbrRJq4w
When actin filaments (the light bands in the diagram above) slide over myosin filaments (the dark bands) the H-zone and I-band decrease.
What causes actin filaments to move?
Myosin filaments contain tiny globular heads, called cross bridges at regular intervals. These cross bridges attach to the actin filaments pulling on them to create movement.
See figure 2 below:
Each flexion of a cross bridge produces only a very small movement in the actin filament so many cross bridges throughout the muscle must flex repeatedly and rapidly for any measurable movement to occur.
On this theory I honestly was pretty confused I plan on coming back but I wanted to post something in my portfolio for now... I refered to http://www.sport-fitness-advisor.com/sliding-filament-theory.html
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