Please enable JavaScript.

Coggle requires JavaScript to display documents.

Breathing (Structure (Diaphragm separates thorax from abdomen (Shallow…

- - - - Continuous envelope around
        lungs, forming airtight seal
      - Area between pleural
        membranes KA pleural cavity
        
        Filled with a thin layer
        of pleural fluid
        
        Acts as lubrication
- - - - Eventually ending as microscopic air sacs, KA alveoli (Sg. alveolus)—Gas exchange occurs here
    - - Support the airways, keeping them open when breathing in
      - Trachea—Rings are
        incomplete, in a C-Shape
        
        Allows peristalsis to occur
        more easily in oesophagus
  - - - Traps particles of dirt and
        bacteria that were breathed in
    - - Beat backwards and forwards,
        sweeping particles out towards mouth
- - - - Two-cell-thick divide between
        alveolus and blood: alveolus
        wall and capillary wall
- - - - Inhalation
        
        Diaphragm muscle contract, flattening the diaphragm
        
        External intercostal muscles contract, pulling ribs upwards and outwards
        
        Volume increases => air enters lungs
      - Exhalation
        
        External intercostal muscles relax, internal muscles contract, pulling ribs down and in
        
        Volume decreases => air exits lungs
        
        Diaphragm muscles relax; diaphragm returns to normal shape