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Respiratory System (Structure of the lungs (Alveoli are the air sacs and…

- - - - One cell thick
      - Good blood supply
      - Large surface area
- - - - Diaphragm and external intercostals contract increasing thoracic cavity volume
    - - Diaphragm, external intercostals, sternocleidomastoid, scalenes and pectoralis major
  - - - Passive process
      - Diaphragm and external intercostals relax
    - - Internal intercostals and Abdominal's contract to force as much air out of the lungs as possible
  - - - Volume of air breathed in our out per breath
      - Increases during exercise
    - - Volume of air that can be forcibly inspired after a normal breath
      - Decreases during exercise
    - - Volume of air that can be forcibly expired after a normal breath
      - Decreases slightly during exercise
    - - The amount of air that remains in the lungs after maximal expiration
      - Remains the same during exercise
    - - Volume of air breathed in our out per minute
      - Big increase during exercise
- - - - Baroreceptors
        
        Detect blood pressure changes so if blood pressure becomes low BR increases
      - Proprioceptors
        
        provide feedback to respiratory center on muscle movement during exercise
      - Stretch receptors
        
        prevent over inflation of the lungs by sending impulses to cause expiration
    - - Parasympaathetic decreases BR
      - Sympathetic increase BR
    - - Inspiratory centre stimulates inspiratory muscles
      - Expiratory centre stimulates expiratory muscles
      - Via Phrenic nerve and intercostal nerve