An Interface Control Document (ICD) describes the relationship between system components in terms of data items and messages passed, protocols observed and timing and sequencing of events.se this template to: Describe the interface(s) to a system or subsystem. Describe the inputs and outputs of a single system, the interface between two systems, the interface protocol from the lowest physical elements to the highest logical levels.
In the most basic terms, the function of norepinephrine is to mobilize the brain and body for action. Norepinephrine release is lowest during sleep, rises during wakefulness, and reaches much higher levels during situations of stress or danger, in what has been called the fight-or-flight response.n the sympathetic nervous system norepinephrine is used as a neurotransmitter by sympathetic ganglia located near the spinal cord or in the abdomen, and is also released directly into the bloodstream by the adrenal glands.
Norepinephrine is a chemical released from the sympathetic nervous system in response to stress. It is classified as a neurotransmitter, a chemical that is released from neurons.