What type of alveolar cells cover over 90 of the surface area of ...

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What type of alveolar cells cover over 90 of the surface area of the alveolar-capillary mem-brane?
 
  a. Alveolar macrophages
  b. Granular pneumocytes
  c. Type I cells
  d. Type II cells

Question 2

What is called the functional unit of the lungs?
 
  a. Only the alveoli
  b. Acinus
  c. Alveolar-capillary membranes
  d. Terminal bronchioles

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Answer to Question 1

ANS: C
The alveolar septa are covered with extremely flat squamous epithelia called type I pneumocytes (Figure 9-54). While they represent only about 8 of all the cells found in the alveolar region, the type I cells cover approximately 93 of the alveolar surface.

Answer to Question 2

ANS: B
The primary lobule or acinus forms the functional unit of the lungs.

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