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Muscle (Control of muscle contraction (tropomyosin (muscle in relaxed,…

- - - - tropomyosin undergo rearragement and exposed the myosin binding sites
        
        myosin head forms a cross-bridge with actin filament and pulls the actin filament in
  - - - T (transverse) tubules
        
        spreads action potential across plasma membrane
  - - - depends on
        
        time taken for calcium concentration in cytosol remains elevated
  - - - for short, rapid and powerful contraction
    - - for slow and sustained cantraction
- - - - When contract
        
        distance between Z-line become shorter
        
        Length of A-band do not change
        
        I-band become shorter
        
        H-zone will disappear
- - - - composed of smaller bundles of myofibril
        
        composed of myofilaments
        
        thin filament
        
        consist of actin strands
        
        Thick filament
        
        consist of myosin strands
  - - - heart contraction
    - - found in the digestive tract, urinary bladder, arteries and internal organs.
      - striated muscle
      - consist of spindle-shaped cells
    - - for body movement
      - striated muscle