Human Physiology and Pathology:Inspiration and Expiration

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  • Created by: jessica
  • Created on: 27-02-13 06:43
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  • Inspiration
    • Inspiratory muscles stimulated to contract by release of Ach
      • Diaphragm contracts, flattening and moving downwards
        • External intercostals contract pivoting the ribs upward and outward, expanding the chest wall
          • Increased volume of the thoraic cavity, pulling outward on the intrapleural fluid
            • the intrapleural pressure is decreased
              • this causes an increase in transpulmonary pressure
                • There is a larger distending pressure across the lungs, expands the chest wall
                  • Decreases the pressure in the alveoli, air flows in until the pressure increases to atmospheric pressure


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