Quick Answer. The function of a synaptic knob is to change the action potential that is carried by axons into a chemical message. The chemical message then interacts with the recipient neuron or effector. This process is called synaptic transmission.
Over-the-counter (OTC) medicines that are recommended for head or pubic lice include: 1  Permethrin creme rinse 1% (such as Nix), which is a common first choice for treating head lice. 2  Shampoos containing pyrethrins and piperonyl butoxide (such as Rid), which are left on the hair for 10 minutes and then rinsed out.
TWO TYPES OF PESTICIDES IN TODAY'S HEAD LICE PRODUCTS. There are two main pesticides used in most head lice products available today: lindane and pyrethrins. LINDANE. For many years, lindane (Kwell), an organochlorine pesticide available only by prescription, was the treatment of choice for head lice. It is still recommended by many medical personnel who have not taken the time to acquaint themselves with its potential health hazards to humans.