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CARDIOVASCULAR SYSTEM - Coggle Diagram

- - - - Covers individual muscle fibers
    - - Intercellular network of cells
      - Calcium ions
    - - End of sarcomere
      - Interlock fibers
      - Cardiac contraction
    - - ATP energy for contraction
    - - Muscle fibers --> thick and thin filaments
    - - Way to z disc --> provide calcium ions
    - - Contractile unit of myocardium
      - Muscle fibers composed of fibrils
      - Parts:
        
        A band
        
        M-line
        
        I band
        
        Z-disc
        
        H zone
      - Contractile proteins
        
        Myosin
        
        Actin
      - Regulatory proteins
        
        Troponin
        
        Tropomyosin
      - Contraction of sarcomere
        
        Neuromuscular junction
        
        Sliding filament theory
        
        Projections twist around causing fibers to slide = power stroke
        
        Sarcomeres shorten, muscle fibers shorten and cardiac muscle contracts
        
        As calcium released, myosin projections attach to actin and cross bridges form
        
        Calcium is pumped back to sarcoplasmic reticulum causing relaxation of muscles
        
        During excitation, calcium enters cell interior across sarcolemma
        
        ATP breakdown
- - - - Closely covers the heart
    - - Slit Like space between parietal and visceral layers
- - - - First heart sound produces when closing of
        AV valves -> Beginning of systole
    - - Second heart sound produced by the
        closure of semilunar valves