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The Heart (Anatomy and organization (Three Layers in the heart wall (1…

- - - - Visceral pericardium
        
        covers the outer surface of the heart
      - Parietal Pericardium
        
        lines the inner sureface of the pericardial sac which surrounds the the heart
        
        Pericardial sac
        
        surrounds the heart
        
        pericardial fluid
  - - - covers the outer surface of the heart that
      - consist of exposed epithelium and underlying layer of loose connective tissue
      - is attached to myocardium
    - - muscular wall of the heart
      - contains cardiac muscle tissue, Blood vessels and Nerves
      - *contractions that increase the pumping efficiency
    - - covers the inner surefaces + the heart valves
      - simple Squamous epithelium
        
        continuous with the endothelium of the attached blood vessels
- - - - pulmonary veins
      - connect the smallest arteries to the smallest veins
        
        easy exchangeable