Why is carbon monoxide particularly dangerous?

Why is carbon monoxide particularly dangerous?

• A. It gets in the blood stream so fast
• B. It corrodes metals
• C. It damages lung tissue only at high concentration
• D. It is highly reactive with water

Answer: (A)

Carbon monoxide is dangerous mainly because it binds to hemoglobin with a much higher affinity than oxygen, forming carboxyhemoglobin. This stops oxygen from binding and being released to body tissues, so organs—especially the brain and heart—come up short on oxygen. When inhaled, CO rapidly enters the bloodstream, so this binding happens quickly and even small amounts can impair oxygen delivery, leading to hypoxia and potentially life-threatening outcomes. While CO can interfere with cellular respiration at very high exposures, the primary hazard is the drastic reduction in oxygen transport. The other statements don’t describe how CO harms the body: it doesn’t corrode metals, it’s not known mainly for damaging lung tissue only at high concentrations, and it isn’t primarily reactive with water.

Carbon monoxide is dangerous mainly because it binds to hemoglobin with a much higher affinity than oxygen, forming carboxyhemoglobin. This stops oxygen from binding and being released to body tissues, so organs—especially the brain and heart—come up short on oxygen. When inhaled, CO rapidly enters the bloodstream, so this binding happens quickly and even small amounts can impair oxygen delivery, leading to hypoxia and potentially life-threatening outcomes. While CO can interfere with cellular respiration at very high exposures, the primary hazard is the drastic reduction in oxygen transport. The other statements don’t describe how CO harms the body: it doesn’t corrode metals, it’s not known mainly for damaging lung tissue only at high concentrations, and it isn’t primarily reactive with water.