Norepinephrine, dopamine, and epinephrine belong to a group of neurotransmitters known as

Catecholamine

Explanation:

Catecholamine are monoamine nuerotransmitters secreted by the adrenal gland when you are under physical or emotional stress. When adrenal gland secretes these hormones they result in an increased cardiac output, breathing, blood pressure and increased blood flow to the skeletal muscles to accommodate the fight or flight response activated during stressful conditions.