Which hormone is primarily associated with the body's fight or flight response?

The hormone primarily associated with the body's fight or flight response is adrenaline, also known as epinephrine. During a stressful situation, the body triggers the release of adrenaline from the adrenal glands, which prepares an individual to face a perceived threat. This process is a key part of the body's acute stress response, leading to physiological changes such as increased heart rate, enhanced respiratory rate, and heightened alertness. These changes enable a person to react quickly and effectively in situations requiring immediate action.

Adrenaline is critical in mobilizing energy resources, increasing blood flow to muscles, and improving oxygen delivery to the brain—all essential for rapid responses in dangerous situations. It is specifically designed to support survival in emergencies, highlighting its role in the fight or flight mechanism.