Which hormone is primarily involved in the fight-or-flight response?

• A. Cortisol
• B. Insulin
• C. Adrenaline
• D. Serotonin

Answer: (C)

The hormone primarily involved in the fight-or-flight response is adrenaline, also known as epinephrine. When faced with a stressful situation, the body activates the sympathetic nervous system, leading to the release of adrenaline from the adrenal glands. This hormone triggers several physiological changes that prepare the body to respond to a perceived threat.

Adrenaline increases heart rate and blood pressure, boosts energy supplies, and enhances respiratory function. It enables quick reactions by diverting blood flow to essential muscles and increasing glucose availability, ensuring that the body is primed for rapid response. This immediate reaction is crucial for survival during high-stress situations.

While cortisol, which is also associated with stress, plays a role in long-term stress responses and metabolic functions, it does not have the same immediate effects as adrenaline in acute situations. Insulin is primarily involved in regulating blood sugar levels, and serotonin is linked to mood regulation, making them less relevant in the context of the fight-or-flight mechanism.