Myofilament Substructure: CrossBridges - PowerPoint PPT Presentation

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Myofilament Substructure: CrossBridges

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Myofilament Substructure: Cross-Bridges. Myofilament Substructure: ... Cylindrical. Multinucleated. 5 to 100 m in diameter. Electron Micrograph of Sarcomere ... – PowerPoint PPT presentation

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Title: Myofilament Substructure: CrossBridges


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Myofilament Substructure Cross-Bridges
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Myofilament Substructure Myosin
  • Two identical heavy chains
  • Several light chains
  • Globular head
  • Long slender neck and tail

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Myofilament Substructure Actin
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Sarcoplasmic Reticulum
  • Hollow collar
  • Both sides of Z line
  • Extends to Z lines
  • Regulates Ca2

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T Tubule
  • Runs around perimeter at Z disk
  • 0.1 µm in diameter
  • Continuous with other tubules
  • Lumen continuous with ECF
  • Brings AP closer to cell interior
  • Close to sarcoplasmic reticulum

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Muscle Anatomy
  • Muscle cells
  • Muscle fibers, Myofibers
  • Long
  • Cylindrical
  • Multinucleated
  • 5 to 100 µm in diameter

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Electron Micrograph of Sarcomere
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