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Muscle Tissue (Smooth Muscle Tissue (Dense bodies (Intermediate filaments…

- - - - During contraction tension is transmitted to the intermediate filaments (do not contract), and the cell twists as it contracts about these stable "rods"
- - - - Myofibrils fill the whole sarcoplasm of the muscle fibre and are are composed of two types of myofilaments
        
        Thin filaments - mostly actin, 8 nm diameter, 1-2 μm long
        
        Thick filaments - myosin, 16 nm diameter, 1-2 μm long
        
        Overlap of filaments pattern sets up striations that can be seen under microscope
  - - - H zone - thick filaments, but no thin filaments
      - M line - middle of sarcomere; holds thick filaments together
      - I band - thin filaments, but no thick filaments
      - Z disc - passes through centre of I band between sarcomeres; made up of "actinins" - link filaments of adjacent sarcomeres
      - A band - dark, middle part; contains ALL thick filaments and overlapping thin filaments
      - Titin - large skeletal muscle protein that links the M line to the Z disc on either side
        
        Aids recoil; provides resting tension in I band; molecular "spring"; does not form any obvious band