The adrenergic nerve fibre secrete norepinephrine at the junction between the nerve.
Adrenaline, noradrenaline, or dopamine are the neurotransmitters for neurons in an adrenergic nerve fibre. The synapse, which is the meeting place of the axon of one nerve cell and the dendrite of another, is where these neurotransmitters are released. In order to attach to the receptor location on the dendrite, the neurotransmitters must first be released from the axon. The sympathetic nervous system, one of the two components of the autonomic nervous system that regulates the fight-or-flight response, has adrenergic nerve terminals in its secondary neurons. Along with other reactions, this system speeds up the heartbeat, inhibits the digestive process, widens the pupils, and regulates the secretion of apocrine sweat glands in the skin's dermal layer.
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