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Berenice Cardenas Per.1 Respiratory System - Coggle Diagram

- - - - Occurs during inspiration
      - Increases in the volume of the thoracic cavity, causes air pressure inside the lungs decreases
        
        ! Its an inverse relationship !
- - - - Inspiratory Reserve Volume(IRV)- volume of air that can be inhaled in addition to the tidal volume, during forced inspiration
        
        Avg~3,000mL
        
        Expiratory Reserve Volume(ERV)- volume of air that can be exhaled during a maximal forced expiration, beyond the tidal volume
        
        Avg~1,200mL
        
        Residual Volume(RV)- volume of air that remains in the lungs after a maximal expiration
        
        Avg~1,200mL (can't be measured w/spirometer)
      - Avg~500mL
  - - - IRV+TV(~3,500mL)
      - Functional Residual Capacity(FRC)- volume of air that remains in the lungs after a resting expiration
        
        ERV+RV(~2,300mL)
        
        Vital Capacity(VC)- maximum volume of air that can be exhaled after a maximal inspiration
        
        Total Lung Capacity- total volume of air that can be held
        
        VC+RV(~5,800ml);varies with age,body size, and body size
        
        TV+IRV+ERV(~4,600mL)
- - - - External intercostals contract to move ribs and sternum upward and outward
        
        The the muscles contracting result in pressure within the lungs falling to 2mm below atmospheric pressure
        
        Causes air to rush into the lungs
  - - - Lungs recoil, pleura and chest wall are pulled inward
        
        Increased surface tension in the alveoli decreases their volume
        
        Intra-alveolar pressure increases to about 1mmHg above atmospheric pressure
        
        As a result, air rushes out of lungs into atmosphere