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CARDIOVASCULAR SYSTEM (HEART (CONDUCTION SYSTEM (SINOATRIAL (SA) NODE…

- - - - SAC OF CONNECTIVE TISSUE THAT ENCLOSES THE HEART
    - - VISCERAL LAYER
      - PARIETAL LAYER
    - - FILLED WITH SEROUS FLUID TO REDUCE FRICTION ON HEART
  - - - VISCERAL LAYER OF SEROUS MEMBRANE
    - - MICROSCOPIC ANATOMY
        
        INTERCALATED DISCS
        
        FASCIA ADHERENS: DESMOSOME-LIKE STRUCTURES
        
        FOUND ALONG TRANSVERSE AND LONGITUDINAL REGIONS
        
        GAP JUNCTIONS
      - COMPOSED OF CARDIAC MUSCLE FIBERS
    - - LINES CHAMBERS AND VALVES; DEEP TO MYOCARDIUM
  - - - TRICUSPID
      - BICUSPID
  - - - SENDS ELECTRICAL SIGNALS TO MYOCARDIUM OF ATRIA AND AV NODE
- - - - CONTAIN PROTEIN HEMOGOLBIN
      - BICONCAVE
    - - PLAY A ROLE IN THE BODY'S IMMUNITY
      - TYPES
        
        BASOPHIL
        
        EOSINOPHIL
        
        NEUTROPHIL
        
        LYMPHOCYTE
        
        MONOCYTE
- - - - STRETCH AND RECOIL
      - TAKE BLOOD AWAY FROM THE HEART
      - INCLUDES AORTA AND ITS BRANCHES
      - LARGEST
    - - TAKE BLOOD TO ORGANS
      - DISTAL TO ELASTIC ARTERIES
      - CONSTRICT AND DILATE TO DECREASE AND INCREASE BLOOD FLOW
    - - SMALL, SMOOTH MUSCLE
      - CONSTRICT AND DILATE
  - - - MOST COMMON
      - FOUND IN CNS, LUNGS, SKIN AND MUSCLE
      - INTERCELLULAR CLEFTS
    - - PORES
      - FOUND IN HIGH EXCHANGE AREAS: SMALL INTESTINE, KIDNEYS, ETC.
    - - LARGE AND WINDING
      - FOUND IN LIVER, SPLEEN AND RED BONE MARROW
      - ALLOW EXCHANGE OF WHOLE CELLS AND PROTEINS
  - - - SMALLEST VEINS; SIMILAR TO CAPILLARIES
    - - CONTAIN VALVES
    - - RETURN BLOOD TO HEART; INCLUDES SUPERIOR AND INFERIOR VENA CAVAS