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Cardiovascular System (Heart (Conduction system of the Heart (SA nodes are…

- - - - very tough sac made up of D.I.C.T
      - located from the diaphragm to the roots of large blood vessels
      - keeps the heart in place
      - keeps it from overfilling
    - - serous membrane, made up of both areolar CT, and Simple Squamous Epithelium
        
        Parietal: On the wall
        
        Visceral: on the organ
    - - Contains serous fluid
      - reduces friction and is lubricating
      - keeps things moving smoothly
  - - - same as visceral pericardium
      - is a serous membrane
    - - muscle of the heart
    - - made up of simple squamous epithelium, and areolar CT
      - lines the heart, and also covers the valves
  - - - Biscupid or Mitral valve
      - Tricuspid valve
    - - Aortic
      - Pulmonary
- - - - helps keep the water inside of the blood vessels
    - - also known as antibodies
      - are transporters
    - - involved with blood clotting
- - - - stretch and recoil
      - has more elastic fibers
      - moves blood away from the heart
      - proximal to the heart, Aorta, and major branches
      - are the largest
    - - takes blood to organs hence the word distributing
      - has more muscle relative to its size
      - distal to the elastic arteries
      - they can constrict or dilate to increase or decrease the bloodflow
    - - smallest of the arteries
      - has only 1-2 layers of smooth muscle
      - can constrict or dilate
  - - - most common
      - located in the CNS, Lungs, and Skin, smooth and skeletal muscle
      - has intercellular clefts (gaps)
      - are somewhat leaky
    - - has capillaries of windows/ little pores
      - located in places with a high rate of exchange--> ex's small Int, Kidneys, Endocrine Glands, Choroid Plexus
    - - has a lot of large spaces
      - large and winding
      - large items can be exchanged such as proteins, and whole cells.
      - located in Red Bone Marrow, Spleen, and the Liver
  - - - less elastic than arteries
      - has valves that help keep blood from being able to return to the heart easily
      - conducts blood back to the heart
    - - are small veins
      - much like capillaries
      - has 1-2 layers of smooth muscle