Final answer:
Succinylcholine is a neuromuscular blocker, that causes persistent depolarization of the motor endplate, resulting in muscle paralysis. The correct answer is option: A. Succinylcholine
Step-by-step explanation:
Succinylcholine is a neuromuscular blocker. This drug works by mimicking acetylcholine at the neuromuscular junction but does not undergo rapid degradation by acetylcholinesterase. As a result, it causes a persistent depolarization of the motor endplate, leading to muscle paralysis. Alternative neuromuscular blockers such as d-tubocurarine block the action of acetylcholine competitively, also leading to muscle relaxation and paralysis.
Neuromuscular blockers are essential in a variety of medical procedures, including anesthesia during surgery to ensure muscle relaxation. They inhibit the release of acetylcholine from neurons, which is necessary for muscle contraction, thus causing flaccid paralysis.