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.
Hood: The metal lid at the front of the car that covers the motor. It is called the Bonnet Britain. Horn: Usually found on the steering wheel, when you press the horn, it makes a sound that other people (in other cars) can hear. Hubcap: The metal covering of the middle part of a wheel.