what does norepinephrine do

Norepinephrine, also known as noradrenaline, is a neurotransmitter and hormone that plays a crucial role in the body's "fight-or-flight" response. It is involved in increasing alertness, arousal, and attention, as well as constricting blood vessels to help maintain blood pressure. Norepinephrine also increases heart rate, blood pumping from the heart, blood pressure, and helps break down fat and increase blood sugar levels to provide more energy to the body