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.
For the treatment of head lice (1% lotion): 1  Shampoo the hair and scalp using regular shampoo. 2  Thoroughly rinse and towel dry the hair and scalp. 3  Allow hair to air dry for a few minutes. 4  Shake the permethrin lotion well before applying.