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.
Most bug repellents contain DEET (N,N-diethyl-m-toluamide) as their active ingredient. DEET is one of the few insect repellents that work. It is recommended to prevent mosquito-born diseases such as malaria, dengue fever, and West Nile virus. Other less effective forms of bug sprays contain pyrethrins.