How does exposure to natural gas affect the body?

• A. The gas acts as a stimulant
• B. The gas damages red blood cells
• C. The gas increases oxygen uptake
• D. Natural gas acts as an asphyxiant

Answer: (D)

Exposure to natural gas acts as an asphyxiant. Natural gas is largely methane, which isn’t directly toxic to the blood or tissues at typical exposure levels, but it can displace breathable oxygen in the air. When the surrounding air has less oxygen, the body can’t oxygenate the blood effectively, leading to symptoms such as dizziness, confusion, shortness of breath, fainting, and, in severe cases, unconsciousness or death if the environment isn’t ventilated or evacuated. This happens because tissues aren’t getting enough oxygen to function, not because the gas is stimulating the body or damaging red blood cells, and it doesn’t increase oxygen uptake. So the danger lies in oxygen displacement and resulting hypoxia, especially in enclosed or poorly ventilated spaces.