VX is an example of which of the following agents?

• A. Blood
• B. Blister
• C. Nerve
• D. Choking/Pulmonary

Answer: (C)

VX is a nerve agent, an organophosphate that blocks acetylcholinesterase, causing acetylcholine to build up at neural and neuromuscular junctions. This overstimulates both muscarinic and nicotinic receptors, leading to rapid, life‑threatening signs such as excessive secretions, sweating, tearing, pinpoint pupils, bronchial secretions, vomiting, abdominal cramps, muscle twitching, weakness, and severe respiratory distress. Its potency and persistence, including skin absorption, place it squarely in the nerve agent category. This distinguishes it from blister agents that damage skin and mucous membranes, choking/pulmonary agents that irritate the respiratory tract and can cause edema, and blood agents that disrupt cellular respiration by inhibiting enzymes like cytochrome oxidase. Understanding that VX disrupts the nervous system by inhibiting acetylcholinesterase explains why it’s classified as a nerve agent.