In a scenario where a patient has low blood oxygen levels but the blood is circulating properly, the most likely structure functioning improperly is the alveoli.
The alveoli are responsible for gas exchange; they are the tiny air sacs in the lungs where oxygen is transferred to the blood and carbon dioxide is removed. If the alveoli are not functioning properly, oxygen cannot effectively enter the bloodstream, leading to low blood oxygen levels despite adequate blood circulation.
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