Associate Safety Professional Practice Exam

Chemical asphyxiants work by:

1. Reducing environmental oxygen levels

2. Interfering with oxygen absorption into blood

3. Creating carbon dioxide in the lungs

4. Blocking airway passages

The correct answer is: Interfering with oxygen absorption into blood

Chemical asphyxiants primarily function by interfering with the body's ability to absorb or utilize oxygen. This occurs through various mechanisms; for instance, certain chemicals can displace oxygen in the bloodstream or hinder hemoglobin's capacity to bind with oxygen effectively. One of the most notable examples of this is carbon monoxide, which binds to hemoglobin more effectively than oxygen, thereby preventing adequate oxygen transportation throughout the body. In contrast to the other possible answers, reducing environmental oxygen levels can lead to asphyxiation, but it is not the specific mechanism through which chemical asphyxiants operate. The creation of carbon dioxide in the lungs is a physiological process rather than a direct action of chemical asphyxiants, and while blocking airway passages can lead to suffocation, it does not describe the action of chemical asphyxiants as a type. Thus, the correct understanding highlights the specific interference with oxygen absorption or utilization as the primary concern with chemical asphyxiants.