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.
How Sound Repellents Work. According to their manufacturers, sound repellent devices emit high-frequency sound waves to frighten or repel rodents such as mice, rats, moles, squirrels and gophers. They claim that the high-frequency noise, which is above the range of human hearing, annoys or frightens rodents to drive them away from a particular area.