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(Blood flow, Anatomy of the heart, Cardiac cycle and the ECG, ABO, Rh…

- - - - serous membrane made up
        of connective tissue and
        epithelium;
      - decreases friction
        in the heart
    - - cardiac muscle, and
        is the thickest layer
        of the heart wall
      - pumps blood out of heart
        chambers
    - - connective tissue
        and epithelium;
      - endothelium of major vessels
        joining the heart
        contains the Purkinje fibers
  - - - Atria receive blood returning to the heart;
      - thin walls and ear-like
        auricles projecting from their exterior
    - - interventricular septum separates
        the ventricle on the right from
        the left
- - - - Parietal pericardium,
        the outer layer of the
        serous membrane
      - Visceral pericardium
        (epicardium), the inner
        layer of the serous
        membrane
      - Pericardial cavity, the space
        between the visceral and parietal layers,