Gas exchange Flashcards
What is dead space?
The volume of air not contributing to ventilation
What are the 2 types of dead space & their volumes?
Anatomical- 150mls
Alveolar-25mls
Total-175mls
Where does gas exchange occur between?
The alveoli & capillaries
What is bulk flow in the airways? What does it require?
Bulk flows allows O2 &CO2 movement - requires a large surface area with minimal distance for gases to move across, adequate perfusion of blood
From the terminal bronchioles to the alveoli, what is the total combined for gas exchange?
40-100m^2
How many alveoli per lung?
300 million per lung
How many capillaries per alveolus?
1000 capillaries
When O2 diffuses from the alveoli to the pulmonary capillaries, how many layers must it diffuse through and name the layers?
7 layers.
- Alveolar epithelium
- Tissue interstitium
- Capillary endothelium
- Plasma layer
- Red cell membrane
- Red cell cytoplasm
- Hb binding
