Author Question: Why is pulmonary surfactant such an important biologic substance? a. It clears out cellular ... (Read 74 times)

xroflmao · **on:** Jul 16, 2018

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 · **Reply #1 on:** Jul 16, 2018

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.