Hemoglobin
A)plays a Critical Role in Determining the Total Amount $\mathrm { P } _ { \mathrm { O } _ { 2 } }$

Multiple Choice

Hemoglobin

A) plays a critical role in determining the total amount of O₂ that is exchanged in the lungs because it removes O₂ and keeps the $\mathrm { P } _ { \mathrm { O } _ { 2 } }$ low so that net diffusion continues
B) combines only with O₂
C) is found in erythrocytes
D) does both a and c
E) does none of the above