Shoest acting muscle relaxant is:-
**Core Concept**
The question is testing the knowledge of the pharmacodynamics of muscle relaxants, specifically their duration of action. Muscle relaxants are a class of medications used to relieve muscle spasm, improve mobility, and facilitate endotracheal intubation. They can be classified based on their mechanism of action, duration of action, and onset of action.
**Why the Correct Answer is Right**
The correct answer is **Succinylcholine**. Succinylcholine is a depolarizing muscle relaxant that acts by competing with acetylcholine for receptors at the neuromuscular junction, leading to muscle contraction and eventually relaxation. Its short duration of action is due to its rapid hydrolysis by the enzyme plasma cholinesterase. Succinylcholine has a rapid onset of action, usually within 1-2 minutes, and its effects last for approximately 4-6 minutes.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not specified, but it's likely a distractor.
**Option B:** This option is not specified, but it's likely a distractor.
**Option C:** This option is not specified, but it's likely a distractor.
**Clinical Pearl / High-Yield Fact**
Succinylcholine is the only depolarizing muscle relaxant in clinical use today. Its short duration of action makes it ideal for rapid sequence intubation, where a quick and secure airway is essential.
**Correct Answer: C. Succinylcholine**