Why is pulmonary surfactant such an important biologic substance? ...

[xroflmao]

Why is pulmonary surfactant such an important biologic substance?
 
  a. It clears out cellular debris.
  b. It is an alveolar macrophage.
  c. It promotes lung contraction aiding exha-lation.
  d. It promotes lung stability.

Question 2

Which type of lung cells secretes pulmonary surfactant?
 
  a. Alveolar macrophages
  b. Type I cells (pneumocytes)
  c. Type II pneumocytes
  d. Type III pneumocytes

[vish98]

Answer to Question 1

ANS: D
Surfactant functions to reduce the surface tension of the alveolus, which results in shedding wa-ter from the alveolar surface; helps to prevent alveolar surface tension-driven collapse; improves lung compliance; and reduces the work of breathing.

Answer to Question 2

ANS: C
Type II cells do not function as gas-exchange membranes like the type I cells. They manufacture surfactant, store it in vesicles called lamellated bodies, and secrete it onto the alveolar surface.

[xroflmao]

Excellent

[amcvicar]

Wow, this really help