Sarcomeres

look it up? Myosin, tropomyosin, and the like? Look up sarcomeres.... etc.

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Myosin changes it's shape when it binds to ATP, making it able to detach from actin and move forward => sarcomeres shorten => contraction

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... about muscle fibres are TRUE? 1-When a sarcomere contracts, the width of the A-band remains unchanged. 2-When a muscle contracts, the width of the sarcomeres shrink, and the length of the myofibrils decreases. 3-The length of the thick filaments in a sarcomere corresponds to the width of the A-band. ...

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... about muscle fibres are TRUE? 1-When a sarcomere contracts, the width of the A-band remains unchanged. 2-When a muscle contracts, the width of the sarcomeres shrink, and the length of the myofibrils decreases. 3-The length of the thick filaments in a sarcomere corresponds to the width of the A-band. ...

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... that this is a very dark region seen in the microscope (just like pyknosis) --> think also of A-bands in de skeletal muscle, the dark region of sarcomeres. The A stands also for anisotropic.

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