Author Question: By what mechanism does gas exchange across the lung occur? a. Active transport b. Facilitated ... (Read 78 times)

Cooldude101 · **on:** Jul 16, 2018

By what mechanism does gas exchange across the lung occur?

a. Active transport
b. Facilitated diffusion
c. Facilitated transport
d. Simple diffusion

Question 2

Developmental morphogenesis of the human respiratory system can be categorized into:

a. three periods.
b. five stages.
c. 6 weeks.
d. 40 weeks.

raenoj · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: D
This close match of gas and blood across a large but extremely thin blood-gas barrier membrane enables efficient gas exchange to occur by simple diffusion.

Answer to Question 2

ANS: B
Figure 9-1 shows the various stages of lung development, and Table 8-1 summarizes the major developmental events in each phase.