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(A) Carboxyhemoglobin is formed when hemoglobin binds with carbon monoxide $(CO)$ instead of oxygen $(O_2)$.Carbon monoxide has an affinity for hemogl

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Carbon monoxide

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(A) Carboxyhemoglobin is formed when hemoglobin binds with carbon monoxide $(CO)$ instead of oxygen $(O_2)$.Carbon monoxide has an affinity for hemoglobin that is approximately $200$ to $250$ times greater than that of oxygen.When $CO$ is inhaled,it binds to hemoglobin to form carboxyhemoglobin,which reduces the oxygen-carrying capacity of the blood,leading to hypoxia.Therefore,an abnormally high level of carboxyhemoglobin in the blood indicates exposure to high levels of carbon monoxide.

$A$ patient's blood analysis shows an abnormally high level of carboxyhemoglobin. Which of the following conclusions is most likely correct? The patient must have inhaled polluted air containing an abnormally high concentration of:

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