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Please select the correct sequence for the layers involved in the diffusion of between the inspired air in the alveoli and the blood:
1. Alveolar epithelial basement membrane
2. Capillary endothelial membrane
3. Thin interstitial space
4. Alveolar epithelium
5. Capillary basement membrane
Choose the appropriate order of these layers during the diffusion of
2, 5, 3, 1, 4
4, 1, 3, 5,2
1, 2, 3, 4, 5
5, 4, 3,2,1
Answers (1)
The correct sequence for the layers involved in the diffusion of CO2 between the inspired air in the alveoli and the blood is:
2. Capillary endothelial membrane
5. Capillary basement membrane
3. Thin interstitial space
1. Alveolar epithelial basement membrane
4. Alveolar epithelium
The capillary endothelial membrane layer separates the blood in the capillaries from the thin interstitial space.
The capillary basement membrane is located beneath the capillary endothelial membrane and provides structural support.
Thin interstitial space lies between the capillary basement membrane and the alveolar epithelial basement membrane allowing for the diffusion of gases.
The alveolar epithelial basement membrane is the basement membrane of the alveolar epithelial cells.
The alveolar epithelium layer consists of the alveolar epithelial cells which are responsible for gas exchange in the alveoli.
Therefore, the correct sequence is 2, 5, 3, 1, 4. Hence, the correct answer is option 1.
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