Which of the following is an example of a nerve agent?

• A. Mustard (HD)
• B. Phosgene
• C. Sarin (GB)
• D. Chlorine

Answer: (C)

Sarin (GB) is classified as a nerve agent because it functions by inhibiting the enzyme acetylcholinesterase, which leads to an accumulation of the neurotransmitter acetylcholine at nerve endings. This disruption at neuromuscular junctions results in continuous stimulation of muscles, causing symptoms such as muscle spasms, respiratory difficulties, and potentially death if exposure is significant.

In contrast, the other substances mentioned are not classified as nerve agents. Mustard (HD) is a blister agent that primarily causes skin and respiratory tract damage. Phosgene is a choking agent and is known for its ability to damage the lungs and cause pulmonary edema. Chlorine, while toxic, operates through respiratory irritation and damage rather than the neurotoxic mechanisms characteristic of nerve agents. Understanding the specific effects and classifications of these agents is crucial in hazardous materials response for effective management and treatment.