Final answer:
Nerve agents like Sarin, VX, and Novichok inhibit the function of acetylcholinesterase, causing the buildup of acetylcholine and uncontrolled muscle contractions.
Step-by-step explanation:
Nerve agents such as Sarin, VX, and Novichok impact the nervous system by inhibiting the function of the enzyme acetylcholinesterase, which is responsible for breaking down the neurotransmitter acetylcholine.
These nerve agents irreversibly bind to the active site of acetylcholinesterase, preventing it from breaking down acetylcholine. As a result, acetylcholine builds up and continues to act, leading to the continuous transmission of nerve impulses and uncontrolled muscle contractions.