AEMCA Practice Exam

What are two common examples of simple asphyxiates?

1. Hydrogen and nitrogen

2. Carbon dioxide and methane

3. Helium and neon

4. Argon and oxygen

The correct answer is: Carbon dioxide and methane

Simple asphyxiates are gases that can displace oxygen in the air and lead to suffocation without causing other harmful effects to the body. In this context, carbon dioxide and methane are good examples of simple asphyxiates because they can accumulate in an enclosed space, reducing the oxygen concentration and posing a risk to individuals present. Carbon dioxide, while produced by respiration and is a normal component of the atmosphere, can become dangerous in high concentrations, as it displaces oxygen. Methane, primarily recognized as a flammable gas, also acts as a simple asphyxiant by displacing air and reducing oxygen levels if present in significant quantities. The other choices involve gases that may not effectively displace oxygen or are not typically highlighted for their asphyxiant properties. Hydrogen and nitrogen are normally present in the atmosphere, with nitrogen making up the majority, but their roles aren't primarily as asphyxiants. Helium and neon are inert and non-toxic gases that don’t pose asphyxiation risks under normal conditions. Argon is another inert gas, and while it can displace oxygen, it's less commonly referenced compared to carbon dioxide and methane when discussing simple asphyxiation.