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 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
D
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Fill in the blank(s) with the appropriate word(s).
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