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.
If you're seeking a natural insect repellent, several types of essential oils may be useful in keeping bugs away and preventing bites and stings. These natural insect repellents can serve as an alternative to synthetic-chemical-based repellents, which may have toxic effects on human health and on the environment.