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Sliding Filament Theory

So, structure of muscles...here's the old picture:





























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So now we have to think about what happens within the sarcomere during muscle contraction, or rather, what
happens to bring about contraction.

Firstly we've got the nerve impulse coming down through to the neuromuscular junction to the muscle cell.
This triggers a release of calcium ions from the sarcoplasmic…

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When the impulse stops, Calcium ions are actively pumped out of the sarcoplasm. This means the calcium
ions aren't around to bind to the troponin on the actin filament, so the tropomyosin covers up the myosin binding
sites. This all leads to the relaxation of the muscle because the actin…

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