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Cardiovascular System - eternity vasquez p6 - Coggle Diagram

- - - - Sinotrial Node,
        
        pacemaker of heart in right atrial wall,
        
        generates impulses about 75 x/ min (sinus rhythm)
        
        impulse spreads across atria and to AV node
      - Atrioventricular (AV) Node,
        
        in inferior interatrial septum
      - Atrioventricular bundle,
        
        in superior interventricular septum ,
        
        only electrical connection between atria and ventricles
      - Right and Left bundle branches,
        
        two pathways in interventricular septum
        
        carry impulses toward apex of heart
      - Subendocardial Conducting network: complete pathway through interventricular septum into apex and ventricular walls
- - - - innermost that is in "intimate" contact with blood ,
        
        Endothelium: simple squamous epithelium that lines lumen of all vessels
        
        Subendothelial Layer: CT basement membrane
    - - middle, composed mostly of smoothed muscle and sheets of elastin
      - sympathetic vasomoter nerve fibers innervate layer, controlling:
        -Vasoconstriction: decreased lumen diameter -Vasodilation: increased lumen diameter
    - - outermost layer of wall
      - aka tunica adventita
      - composed of loose collagen fibers that protect and reinforce wall and anchor it to surrounding structures