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.
Permethrin is an active-ingredient insecticide used in many professional pest-control products to control a wide variety of pests, including ticks, fleas, mosquitoes, bedbugs, chiggers, flies, termites, and cockroaches. Permethrin is often used as a spray on fabrics, clothing, and bed nets to repel or kill insects.