A patient has low blood oxygen levels, although the patient's blood is circulating properly. Which is most likely functioning improperly?

A patient has low blood oxygen levels, although the patient's blood is circulating properly. Which is most likely functioning improperly?

A. the aorta
B. the pulmonary vein
C. the capillaries
D. the alveoli

Correct answer is option D. The Vlveoli. Explanation: A patient has low blood oxygen levels, although the patient's blood is circulating properly. The alveoli is most likely functioning improperly.