Adrenergic Neurotransmitters and Their Types Adrenergic Neurotransmitters and Their Types Adrenergic neurotransmitters are a crucial part of the human nervous system. They play a vital role in the transmission of signals between nerve cells and various target tissues. These neurotransmitters are derived from the amino acid tyrosine and have a profound impact on physiological responses. Types of Adrenergic Neurotransmitters Adrenergic neurotransmitters can be categorized into two main types: norepinephrine and epinephrine. 1. Norepinephrine Norepinephrine, often referred to as noradrenaline, is a neurotransmitter released by the sympathetic nervous system. It plays a key role in the "fight or flight" response, increasing heart rate, constricting blood vessels, and raising blood pressure. Norepinephrine also affects mood and arousal. 2. Epinephrine Epinephrin...