Hemoglobin
a. plays a critical role in determining the total amount of O2 that is exchanged because it acts as a storage depot, removing dissolved O2 and thus keeping the PO2 low so that net diffusion is allowed to continue.
b. combines only with O2.
c. is found in erythrocytes.
d. both (a) and (c) above.
e. all of these answers.
D
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