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Muscular System (Sarcomere (Sarcoplasmic reticulum (Wrapped around each…

- - - - Runs between sarcoplasmic reticulum and terminal cisternae
    - - Allows action potentials to move rapidly
- - - - Myoglobin
        
        Protein that stores oxygen
  - - - Myosin- thick
        
        Each filamant has two heads cross branching off it
      - Actin- thin
        
        Twisted into double helix (double stranded chain of pearls
      - Part of repeated unit called sarcomere
- - - - Nerve and blood supply- One nerve, One or ore veins, and one artery
        
        Arteries deliver oxygen and nutrients (muscle fibers need large amounts of energy to contract)
        
        Give off waste
        
        Capillaries, long and winding with cross links
        
        Where oxygen diffuses into cells
      - Muscle has connective tissue sheaths
        
        Connective tissue sheaths wrap around individual muscle fibers
        
        Prevent bulging muscles from bursting with strong contractions
        
        Epimysium - whole muscle
        
        When muscle fibers contract, they pull on sheathes and pull bone to be moved
        
        Endomysium - one muscle fiber
        
        Perimysium fascicles
        
        Endoysium wrapped cells grouped into bundles called fascicles
        
        Fascicles surrounded by perimysium
        
        Epimysium ... Perimysium... Endomysium... Plasma membrane
- - - - Breaks down ACh after action potential is done