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.
Pyrethrins do not kill unhatched nits, retreating in seven to ten days is recommended. NIX AKA Permethrins is safe, effective and may continue to kill newly hatched eggs for several days after treatment. A second treatment may be needed in seven to 10 days to kill any newly hatched lice.