Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
The primary hormone refers to the main hormone that is released in response to a stressful event. It plays a crucial role in activating the body's stress response system.
Adrenaline, also known as epinephrine, is a related term that works alongside the primary hormone. It is responsible for increasing heart rate, blood pressure, and energy levels during stressful situations.
Cortisol is another related term that is released in response to stress. It helps regulate various bodily functions such as metabolism, immune responses, and inflammation.
Fight-or-flight response: The fight-or-flight response is an immediate physiological reaction triggered by the release of the primary hormone. It prepares the body to either confront or flee from a perceived threat or danger.