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.
The best insect repellent can get under your skin. DEET is widely embraced as the most effective insect repellent at a time of growing fear of mosquitoes and ticks. DEET (N, N-diethyl-3-methylbenzamide) masks the chemical signals that insects use to find their victims. And it is partially absorbed into human skin. Opinions vary on the safety of DEET.