Final answer:
The two respiratory hazards responsible for the majority of fire-related fatalities are carbon monoxide (CO) and hydrogen cyanide. Thus, correct answer is option C.
Step-by-step explanation:
Two predominant respiratory hazards associated with fire-related fatalities are carbon monoxide (CO) and hydrogen cyanide. Carbon monoxide, a toxic gas, emerges from the combustion of fossil fuels and is frequently present indoors due to faulty chimneys, gas-powered generators, or burning charcoal. Inhalation of high concentrations of CO poses severe health risks, as it hampers oxygen transport in the bloodstream.
Hydrogen cyanide, another lethal gas produced during combustion, acts by disrupting cellular respiration, impeding the body's ability to utilize oxygen efficiently. Its toxic effects can prove fatal, and exposure commonly occurs in various fire scenarios. Both carbon monoxide and hydrogen cyanide emphasize the critical importance of addressing respiratory hazards in fire safety measures.
Understanding their sources, mechanisms of toxicity, and implementing preventive measures are pivotal in safeguarding against the life-threatening consequences of these gases during fire incidents.