Which among the following gases readily binds with blood hemoglobin?
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Answer: A. Carbon monoxide
Explanation
Carbon monoxide possesses a significantly higher binding affinity for blood hemoglobin compared to normal molecular oxygen. When inhaled, it binds tightly to hemoglobin molecules to form stable carboxyhemoglobin complexes rapidly within blood. This preferential binding severely impairs the oxygen-carrying capacity of blood, preventing proper delivery to body tissues. Hemoglobin is a specialized iron-containing protein in red blood cells designed to transport oxygen from lungs outward. Carbon monoxide is a colorless and odorless toxic gas produced by incomplete combustion of carbon-containing fossil fuels. Affinity refers to the chemical tendency of a molecule to bind strongly with a specific receptor or protein.
Methane is a stable hydrocarbon gas that does not bind strongly to hemoglobin under normal physiological conditions. Oxygen binds reversibly to hemoglobin to facilitate normal aerobic respiration and cellular energy production throughout tissues. Nitrogen dioxide is a noxious air pollutant that causes severe respiratory irritation rather than binding human hemoglobin.
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