Peak Performance - Gas exchange - Composition of alveoli air
9 important questions on Peak Performance - Gas exchange - Composition of alveoli air
Why is there a difference between the alveoli air and the atmospheric air?
- Atmospheric air is not humidified. The air becomes humidified by the water vapour on the respiratory passages before it enters the alveoli.
- O2 and CO2 are diffusing across the alveoli wall.
- Alveoli air mixes with dead space air during expiration.
- The Pal cannot exceed the Patm (760mmHg above sea level). The water vapour will partially dilute the gases= partial pressure of the gases in the alveoli < than in the atmosphere.
What affects the concentration/partial pressure of CO2 in the alveoli?
Concentration in the alveoli is inversely proportional to the rate of ventilation.
What is the composition of exhaled air?
2nd: mixture of dead space air and alveoli air.
3rd: alveoli air only.
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How do you measure the composition of alveoli air?
What is the partial pressures in exhaled air?
What is the difference between the FRC and the alveoli air?
Alveoli air= 350ml
What is the importance of the slow rate of renewal of alveoli air?
Prevents sudden changes in the concentration of O2, CO2 and H+ following short interruptions in breathing.
Therefore, stabilises the respiratory control centres.
What is the structure of the respiratory membrane?
2. Alveolar epithelium- lined with epithelial cells.
3. Epithelial basement membrane
4. Interstitial space between the alveoli and the capillary.
5. Capillary basement membrane- fuses with the alveoli epithelial basement membrane in various places.
6. Capillary endothelial lining.
Where does gas exchange occur along the respiratory membrane?
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