Certified Hyperbaric Technologist Practice Test

What is a primary source of carbon monoxide?

1. Complete combustion

2. Incomplete combustion

3. Exhalation of breath

4. Plant respiration

The correct answer is: Incomplete combustion

A primary source of carbon monoxide is incomplete combustion. This occurs when a fuel, such as gasoline, wood, or coal, burns without enough oxygen present to allow for complete oxidation of the carbon in the fuel. Incomplete combustion produces carbon monoxide as a byproduct, which can be harmful when inhaled, as it interferes with the blood's ability to carry oxygen. In contrast, complete combustion occurs when there is ample oxygen, resulting in carbon dioxide being the main byproduct instead of carbon monoxide. The exhalation of breath does contain small amounts of carbon monoxide but is not a significant source. Plant respiration also produces carbon dioxide rather than carbon monoxide, further distinguishing it from the correct choice. Understanding these differentiations is crucial in identifying sources of carbon monoxide and emphasizes the importance of proper ventilation and combustion practices to minimize carbon monoxide exposure.