Pesticide Hazards And First Aid MEDIUM EPA Recognition and Management of Pesticide Poisonings (6th Ed.)

An applicator exposed to organophosphate or N-methyl carbamate insecticides begins experiencing pinpoint pupils (miosis), excessive salivation, muscle twitching, nausea, and tremors. What biological mechanism causes these acute symptoms?

Multiple Choice Options

A Inhibition of the acetylcholinesterase enzyme, causing an accumulation of acetylcholine at neural junctions. ✓ OFFICIAL VERIFIED CORRECT ANSWER
B Blockade of GABA-gated chloride ion channels in peripheral motor units.
C Disruption of hepatic glycogen synthesis resulting in acute severe hypoglycemia.
D Uncoupling of mitochondrial oxidative phosphorylation resulting in systemic metabolic alkalosis.
✓ LEGAL EXPLANATION & STATUTORY RATIONALE
EPA Recognition and Management of Pesticide Poisonings (6th Ed.)
Official Manual Chapter: Chapter 5: Pesticide Hazards and First Aid

Organophosphates and carbamates bind to and inhibit acetylcholinesterase (AChE), preventing the breakdown of acetylcholine. The neurotransmitter hyper-accumulates at nerve synapses and neuromuscular junctions, causing hyperstimulation (SLUDGE: Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis, and miosis).

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