Carbon monoxide binds with hemoglobin to form carboxyhemoglobin. Which one of the following statements about carbon monoxide is not true?

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2022-12-05

The background level of carboxyhemoglobin in the blood is about 0.4 percent
Smoking one pack of cigarettes a day increases the background level tenfold
The affinity of carbon monoxide for hemoglobin is 200 times more than that of oxygen
Carboxyhemoglobin levels of greater than 25 percent can be fatal
A characteristic sign of carbon monoxide poisoning is acrocyanosis

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