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Cardiovascular System (Heart (Conduction System (Timing 1. SA node -…

- - - - keep heart in place and from overflowing
      - structure is thick
    - - parietal and visceral layers
      - membranes are simple squamous
      - areolar C.T.
  - - - outer, protective layer
      - also helps with producing fluid
      - coronary blood vessels found here
    - - middle muscular layer
      - therefore thickest layer
    - - inner layer
      - continuous with endothelium of the large blood vessels
  - - - right atrium to right ventricle = tricuspid valve
      - left atrium to left ventricle = bicuspid valve
      - pulmonary semilunar valve
      - aortic semilunar valve
- - - - stretch and recoil
        
        ex: aorta
    - - parts of the body/organs
      - can constrict or dilate to manage blood flow
    - - smallest of the arteries
        
        can also constrict and dilate
  - - - smallest of the veins
  - - - most common
      - intercellular clefts - somewhat leaky
      - found: CNS, lungs, skin, smooth and skeletal muscles
    - - found at high rates of exchange
      - "little windows"
      - ex: kidneys, small intestine, choroid plexus
    - - found everywhere, exceptions - avascular locations: epithelia, cartilage, cornea and lens
      - large and winding
      - large items can be exchanged. ex: proteins and whole cells
      - other examples: liver and proteins, blood cells made in red bone marrow, also found in the spleen
- - - - helps keep water in blood vessels
    - - helps with blood clotting
    - - transporter for hydrophobic substances
      - immunoglobulins - antibodies
  - - - biconcave shape, carries O2 and other nutrients
      - contains hemoglobin (iron molecules withini) - which Hb binds w/ O2
    - - White blood cells
      - 5 types - I know these from lab
      - involved with immunity
    - - blood clotting
      - smallest blood cell
    - - pieces of cytoplasm from megakarocytes
      - involved with blood clotting