Sliding filament theory

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Last updated 5:28 AM on 4/2/26
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4 Terms

1
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Sliding filament theory

  • explains how a muscle can shorten from a macroscopic perspective

  • sliding filament theory: during contraction the thin filaments slide past the thick filaments so that actin and myosin overlap to a greater degree

  • when a muscle shortens it shortens at the sarcomere and within the sarcomere the thin filaments attached to the z discs are sliding over the thick filaments so the Z discs move closer together during muscle contraction

2
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Sarcomere shortening: relaxed

  • Z discs: dark ling, easy to distinguish

  • H zone is bisected by the M line

  • can see I band and A band

  • there are regions of the sarcomere where there is either no thick or thin filament

<ul><li><p>Z discs: dark ling, easy to distinguish</p></li><li><p>H zone is bisected by the M line</p></li><li><p>can see I band and A band</p></li><li><p>there are regions of the sarcomere where there is either no thick or thin filament</p></li></ul><p></p>
3
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Sarcomere shortening: partially stimulated

  • z discs in this image are closer together

  • Z discs move towards the center by the thin filaments are sliding over the thick filaments and the thin filaments are attached to the Z discs

  • if the thin filaments are sliding past the thick filaments, the distance between the z discs will decrease
    - as contraction continues, the distance between the z discs get even shorter

<ul><li><p>z discs in this image are closer together</p></li><li><p>Z discs move towards the center by the thin filaments are sliding over the thick filaments and the thin filaments are attached to the Z discs</p></li><li><p>if the thin filaments are sliding past the thick filaments, the distance between the z discs will decrease<br> - as contraction continues, the distance between the z discs get even shorter</p></li></ul><p></p>
4
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Sarcomere shortening: fully contracted

  • when the sarcomere is fully contracted, you will no longer be able to see the I bands, but may be able to distinguish the M lines

<ul><li><p>when the sarcomere is fully contracted, you will no longer be able to see the I bands, but may be able to distinguish the M lines</p></li></ul><p></p>