1 Symptoms are due to the effects of excess acetylcholine on nicotinic and muscarinic acetylcholine receptors in the CNS, at neuromuscular junctions, and in the sympathetic, and parasympathetic nervous systems. 2  Nicotinic and muscarinic receptors have different. 3  Functions. 4  Locations.
The reason snake repellents don t work is because there is nothing intimidating to a snake about the smell of naphthalene or sulfur. Even if there were, snakes do not smell the way people traditionally assume they do. Snakes use smell as a method of information.
Insect repellents are important public health tools for the prevention of vector-borne infectious diseases. Technically, an insect repellent is any chemical -- natural or synthetic -- that causes insects or other arthropods to make directed, oriented movements away from the source of repellent.nsect repellents are important public health tools for the prevention of vector-borne infectious diseases. Technically, an insect repellent is any chemical -- natural or synthetic -- that causes insects or other arthropods to make directed, oriented movements away from the source of repellent.