Final answer:
Many drugs and poisons act as inhibitors of nervous system enzymes, affecting nerve impulse transmission and potentially causing paralysis.
Step-by-step explanation:
Many drugs and poisons are inhibitors of enzymes in the nervous system. These substances can interfere with the normal function of enzymes such as acetylcholinesterase, which plays a crucial role in breaking down the neurotransmitter acetylcholine at synapses and neuromuscular junctions in both central and peripheral nervous systems.
Nerve poisons like carbamates and organophosphorus compounds, including parathion, can disrupt nervous system activity by leading to an excess buildup of acetylcholine, ultimately causing continuous muscle contraction or even paralysis. Similarly, drugs like atropine can manage the symptoms of nerve agent poisoning. Psychoactive drugs also play a role in the nervous system by mimicking or influencing neurotransmitters, which are essential for nerve impulse transmission.