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(D) Carboxyhemoglobin is formed when carbon monoxide $(CO)$ binds to hemoglobin in the blood. Carbon monoxide has an affinity for hemoglobin that is a

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Carbon monoxide

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(D) Carboxyhemoglobin is formed when carbon monoxide $(CO)$ binds to hemoglobin in the blood. Carbon monoxide has an affinity for hemoglobin that is approximately $200-250$ times greater than that of oxygen $(O_2)$. When $CO$ is inhaled,it binds to hemoglobin to form a stable compound called carboxyhemoglobin,which prevents the blood from carrying oxygen effectively to the body tissues. Therefore,high levels of carboxyhemoglobin in the blood indicate exposure to high concentrations of carbon monoxide.

When a patient's blood analysis shows high levels of carboxyhemoglobin,which of the following conclusions is most likely correct? The patient must have been inhaling polluted air containing an unusually high concentration of ..........

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