ACETYLCHOLINE

Acetylcholine is a key neurotransmitter that regulates muscle contraction, cognitive functions, and autonomic processes. It acts on nicotinic and muscarinic receptors. While not used directly as a drug, its effects are targeted by medications such as cholinergic agonists and acetylcholinesterase inhibitors to treat conditions like Alzheimer's disease and myasthenia gravis.

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