Hemoglobin in erythrocytes is responsible for carrying oxygen around the body. A

Question

Hemoglobin in erythrocytes is responsible for carrying oxygen around the body. At which location does this tetrameric molecule bind most avidly to oxygen?

A. Venules
B. Aorta
C. Pulmonary arteries
D. Pulmonary veins
E. Capillary bed

...................................................................................................
I thought that it should be pulmonary veins since the heme groups in hemoglobin utilizes the cooperative binding with oxygen, so the more oxygen, the easier and stronger it will bind to hemoglobin. But the answer is pulmonary arteries and I can't seem to understand why.

Thank you

Explanation / Answer

Hemoglobin in erythrocytes is responsible for carrying oxygen around the body. At which location does this tetrameric molecule bind most avidly to oxygen?

A. Venules
B. Aorta
C. Pulmonary arteries
D. Pulmonary veins
E. Capillary bed

exchanges of gases --------Pulmonary arteries

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