Scrabble?! MUSCARINES

Definitions of MUSCARINES in various dictionaries:

A muscarinic receptor antagonist (MRA) is a type of anticholinergic agent that blocks the activity of the muscarinic acetylcholine receptor. Acetylcholine (often abbreviated ACh) is a neurotransmitter whose receptor is a protein found in synapses and other cell membranes. Besides responding to their primary neurochemical, neurotransmitter receptors can be sensitive to a variety of other molecules. Acetylcholine receptors are classified into two groups based on this: muscarinic, which respond to muscarine nicotinic, which respond to nicotineMost muscarinic receptor antagonists are synthetic chemicals; however, the two most commonly used anticholinergics, scopolamine and atropine, are belladonna alkaloids, and are naturally extracted. Muscarinic antagonist effects and muscarinic agonist effects counterbalance each other for homeostasis. Certain substances are known as long-acting muscarinic receptor antagonists (LAMAs).