Indicate the Effect the Following Changes Would Have on the Rate

Short Answer

Indicate the effect the following changes would have on the rate of gas transfer using the following answer code.
a.Increases the rate of gas transfer
b.Decreases the rate of gas transfer
c.Has no effect on the rate of gas transfer
-Effect of a fall in atmospheric $\mathrm { P } _ { \mathrm { O } _ { 2 } }$ on O₂ exchange within the lungs