Which is an asphyxiant?

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Multiple Choice

Which is an asphyxiant?

Explanation:
An asphyxiant is a substance that prevents oxygen from getting to tissues. Carbon monoxide is a classic example because it binds very strongly to hemoglobin, forming carboxyhemoglobin. This greatly reduces the blood’s ability to carry oxygen and also makes the remaining hemoglobin hold onto oxygen more tightly, so the oxygen isn’t released efficiently to cells. Even with normal air oxygen levels, tissues can become hypoxic, leading to dizziness, confusion, and in severe cases loss of consciousness. The other chemicals listed have toxic effects through different mechanisms—neurotoxic effects, irritation, or carcinogenic effects—but they do not primarily disrupt oxygen delivery in the way carbon monoxide does.

An asphyxiant is a substance that prevents oxygen from getting to tissues. Carbon monoxide is a classic example because it binds very strongly to hemoglobin, forming carboxyhemoglobin. This greatly reduces the blood’s ability to carry oxygen and also makes the remaining hemoglobin hold onto oxygen more tightly, so the oxygen isn’t released efficiently to cells. Even with normal air oxygen levels, tissues can become hypoxic, leading to dizziness, confusion, and in severe cases loss of consciousness. The other chemicals listed have toxic effects through different mechanisms—neurotoxic effects, irritation, or carcinogenic effects—but they do not primarily disrupt oxygen delivery in the way carbon monoxide does.

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