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PE - Respiratory System - Coggle Diagram

- - - - up and out
    - - down
  - - - flattens
    - - curves
- - - - one-cell thick
      - moist lining
      - surrounded by capillaries
      - large surface area
  - - - alveoli fill with (oxygen) air
        
        increases concentration of oxygen in alveoli
        
        gases move from an area of high concentration to low concentration
        
        oxygen diffuses from alveoli into bloodstream
  - - - CO2 diffuses from capillary into alveoli to be expired / exhaled
  - - - oxyhaemoglobin
        
        transported back to heart
        
        pulmonary vein
        
        ejected out of left ventricle
- - - - diaphragm contracts and flattens
      - intercostals contract
        
        pulling rib cage up and out
      - volume increase
      - pressure decrease
      - air containing oxygen rushes in
  - - - diaphragm relaxes and returns to dome
      - intercostals relax
        
        rib cage in and down
      - volume decrease
      - pressure increase
      - air containing CO2 rushes out