What is the main reason sulfur dioxide irritates the upper respiratory mucous membrane?
It dissolves in moisture in upper respiratory tract and forms irritant
The main reason sulfur dioxide irritates the upper respiratory mucous membrane is due to its chemical properties and interaction with moisture in the respiratory tract.
- Understanding Sulfur Dioxide (SO2): Sulfur dioxide is a colorless gas with a sharp, pungent odor, commonly released during the burning of fossil fuels. It is a significant air pollutant affecting human health.
- Interaction with Moisture: When sulfur dioxide (SO2) is inhaled, it comes into contact with the moisture present in the upper respiratory tract.
- Chemical Reaction: In the presence of moisture, SO2 dissolves to form sulfurous acid (H2SO3), which is an irritant.
- Irritation of Mucous Membranes: The formation of sulfurous acid leads to irritation of the mucous membranes lining the upper respiratory tract, causing symptoms such as coughing and throat irritation.
- Conclusion: The correct option is: It dissolves in moisture in upper respiratory tract and forms irritant. This explains how SO2 causes irritation upon exposure.
This reaction and its effects are well-cited in environmental health studies and align with pollutants' behavior in the respiratory system.
Ruling Out Other Options:
- Option 2: Although sulfur dioxide can oxidize to sulfur trioxide, this reaction primarily occurs in the atmosphere rather than directly in the respiratory tract.
- Option 3: Sulfur dioxide is unlikely to combine with other pollutants and polymerize within the lungs in this manner.
- Option 4: SO2 does not combine with hemoglobin to affect oxygen transport directly; this is more characteristic of carbon monoxide.
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