Author Question: What is the best measure of the efficiency of gas exchange in the lung? a. PaCO2 b. VDS/VT c. ... (Read 42 times)

silviawilliams41 · **on:** Jul 16, 2018

What is the best measure of the efficiency of gas exchange in the lung?

a. PaCO2
b. VDS/VT
c. End-tidal PCO2
d. PaCO2/PETCO2

Question 2

What is the normal range for P(Aa)O2 in a healthy 30-year-old person breathing room air?

a. 0 to 10 mm Hg
b. 5 to 15 mm Hg
c. 10 to 20 mm Hg
d. Cannot predict

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

Answer to Question 1

ANS: B
The dead space-tidal volume ratio (VD/VT) is a measure of the efficiency of gas exchange.

Answer to Question 2

ANS: B
For example, a healthy person has a P(Aa)O2 of 5 to 15 mm Hg while breathing room air.