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The Musculoskeletal System
Muscle Contraction and Locomotion
Biology Textbooks Boundless Biology The Musculoskeletal System Muscle Contraction and Locomotion
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Biology
Concept Version 11
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Sliding Filament Model of Contraction

The sarcomere and the sliding filament model of contraction

The sarcomere and the sliding filament model of contraction

During contraction myosin ratchets along actin myofilaments compressing the I and H bands. During stretching this tension is release and the I and H bands expand. The A-band remains constant throughout as the length of the myosin myofilaments does not change.

This diagram describes the sliding filament model of contraction. Terms include A-band, I-band, H-band, CapZ, titin, Z-line, myocin head, myocin tail, actin filament, relaxed, contracted, and M-line.

Source

    Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:

    "Sarcomere.png."
    https://commons.wikimedia.org/wiki/File:Sarcomere.svg Wikipedia - Adapted From GNU FDL 1.2.

Related Terms

  • M-line
  • Z-line
  • H-band
  • I-band
  • A-band
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