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Cardiovascular System (HEART (LAYERS OF THE HEART WALL (Myocardium- Middle…

- - - - Parietal pericardium- layer between fibrous pericardium and visceral pericardium.
      - Visceral pericardium- most inner layer of pericardium and the outer layer of the heart. Assists in production of pericardial fluid.
      - Fibrous pericardium-outer fibrous sac that covers the heart.
  - - - Step 2: AV Node Impulse conduction. The atrioventricular (AV) node impulse after the impulse from the SA node reaches it. There is a 1/10 of a sec delay in impulse time which allows atria to contract and empty into ventricles.
        
        Step 3: AV bundle Impulse Conduction. The impulses are then sent down the atrioventricular bundle. The two bundles branch off and are carried down the center of the heart to the left and right ventricles.
        
        Step 4: Purkinje Fibers Impulse Conduction. At the base of the heart the AV bundles divide into Purkinje fibers. When the impulse reach these fibers they trigger the muscle fibers in the ventricles to contract. The right ventricle sends blood to the lungs via the pulmonary artery while the left ventricle pumps blood to the aorta.
- - - - Neutrophils- most abundant white blood cell.
      - Lymphocytes- common in lymphatic system. B-cells and T-cells.
      - Eosinophils- Rare in the blood but numerous in the mucous membranes of the respiratory, digestive, and lower urinary tracts. Primarily deal with parasite infections.
      - Monocytes- largest type of white blood cell. Present pieces of pathogens to T cells.
      - Basophils- typically responsible for allergic and antigen response. Release histamine and heparin.