Human Physiology and Pathology:Inspiration and Expiration
- 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
- There is a larger distending pressure across the lungs, expands the chest wall
- this causes an increase in transpulmonary pressure
- the intrapleural pressure is decreased
- Increased volume of the thoraic cavity, pulling outward on the intrapleural fluid
- External intercostals contract pivoting the ribs upward and outward, expanding the chest wall
- Diaphragm contracts, flattening and moving downwards
- Inspiratory muscles stimulated to contract by release of Ach
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