To what does the term faster-weaker refer when discussing the ...

[gonzo233]

To what does the term faster-weaker refer when discussing the alveolar-capillary membrane?
 
  a. Portion of the alveolar-capillary membrane that is average in thickness
  b. Shortest airways in the acinus, which al-low fast gas exchange
  c. Thinnest portion of the alveolar-capillary membrane
  d. Thickest portion of the alveolar-capillary membrane

Question 2

What intercommunicating channels permit collateral ventilation between adjacent alveoli and primary lobules? 1. Bronchial anastomoses 2. Canals of Lambert 3. Pores of Kohn 4. Terminal bronchioles
 
  a. 1, 2, and 3 only
  b. 1 and 4 only
  c. 2 and 3 only
  d. 1, 2, 3, and 4

[chem1s3]

Answer to Question 1

ANS: C
On one side of the alveolar wall, the type I cell and capillary endothelial cells lie close together with a thin interstitial space. This part of the blood-gas barrier is, on average, 0.2 to 0.3 m thick and it is where the alveolar capillary bulges into the alveolar space. On the other side, where there is a thicker interstitial space with greater fiber, matrix, and nuclear material content, the barrier can be more than 3 to 10 times thicker. This functionally results in faster-weaker and slow-er-stronger diffusion sides of the blood-gas barrier.

Answer to Question 2

ANS: C
Small openings are located in the alveolar septa. Some of the openings allow gas to move from one alveolus to another. These are called the pores of Kohn. Other openings connect alveoli with secondary respiratory bronchioles. These passageways are called the canals of Lambert. All of these alveolar openings and passageways facilitate the collateral movement of gas and help maintain alveolar volume.