Unlike an electrical synapse, the chemical synapses are separated by a space called the synaptic cleft, typically measured between 15 and 25 nm. Transmission of an excitatory signal involves several steps outlined below.
Definition of cap. 1  1a : a head covering especially with a visor and no brimb : a distinctive head covering emblematic of a position or office: such as (1) : a cardinal's biretta (2) : mortarboard.
Flat cap (also known as a Kerry cap in Ireland (slang of Paddy cap - see also Caubeen), longshoreman's cap, scally cap, Wigens cap, ivy cap, golf cap, duffer cap, driving cap, bicycle cap, Jeff cap, or in Scotland, bunnet, or in Wales, Dai cap, or in England or New Zealand, cheese-cutter)