Filament theory

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Last updated 4:02 AM on 10/8/26
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7 Terms

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Calcium in sarcomere

Nerve waves cause sarcoplasmic reticulum to release calcium and clear a path

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Actin

Thin protein discs anchored to Z-discs that attach to myosin

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Myosin

Thick proteins with heads that bind to form bridges with actin

4
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Sarcomere

muscle being contracted

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Troponin and tropomyosin

Regulator proteins that either block or allow myosin to bind to actin

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Sliding filament theory

Converting energy into force using muscle fibers

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Steps to theory

  1. Signal is received and calcium is released

  2. Calcium ions bind to troponin so that tropomyosin moves away for myosin and actin to bind

  3. ATP energy shortens the muscle (sarcomere)

  4. New ATP is attached so the process can restart