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Study Nugget: Muscle Contraction

Posted by: Andrew  :  Category: Study Nugget
MuscleSarcomere 300x225 Study Nugget: Muscle Contraction

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There is a theory about how muscles contract called “The Sliding Filament Theory”; The sarcomere inside the muscle fibre has two protein filaments, Myosin (thick) and Actin (thin).

The Myosin filament has heads that nod and connect to the Acitn filament and then it pulls it forward to the centre of the sarcomere (this is also call the power stroke) and then the muscle is contracted.

Then in reverse; the heads on the myosin are released from the acitn filaments and then they lengthen (called the recovery stroke) and the muscle is now relaxed.


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