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Valves and vessels (4 valves (Atrioventricul (Left: Mitral/Bicuspid, Right…

- - - - Thin layer of smooth muscle
    - - Precapillary sphincter zone, regulates blood flow to cap. beds
    - - Sinusoid
        
        Modification of capillary
        
        Thin walled, relatively large diameter tubular channel
        
        Fenestrations
        
        Gaps in endothelium allowing free communication
        
        Slow blood flow
      - Capillary beds
        
        Thin walled for exchange
    - - Withstand high pressure from heart
  - - - Form networks : Retia
  - - - Diapedesis: Diffusion of cells out of vessel lumen
      - Means for white blood cells to enter tissues
    - - Smooth muscle
      - Blood reservoir
    - - Smooth muscle & some elastic fibres
      - Return blood to heart
    - - Enable capillary bed shut down
      - Blood straight arteriole -> venule
        (Bypass capillaries)
- - - - Varying amount of smooth muscle/elastic tissue depending on vessel type
    - - Connective tissues
      - Vasa vasorum in some large arteries
    - - Has endothelial lining