1. A hormone and neurotransmitter produced by the adrenal glands and nerve cells; also called norepinephrine. It increases heart rate, blood pressure, and alertness in response to stress.
Usage: Also called norepinephrine, especially in North American medical contexts.; Plural form of noradrenaline.; Used in medical and scientific contexts.

Examples

• Noradrenalines are released during the fight-or-flight response.
• The body produces noradrenalines to help cope with stress and danger.
• Levels of noradrenalines increase when you exercise or feel anxious.
• Certain medications affect how the brain uses noradrenalines.
• The sympathetic nervous system relies on noradrenalines to prepare the body for action.