The primary hormone responsible for physiological stress responses such as increased heart and breathing rates is

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Epinephrine, also known as adrenaline, is a hormone released by the adrenal glands in response to stress. It acts quickly to increase heart rate, breathing rate, and blood pressure in order to prepare the body for a "fight or flight" response. Cortisol is another hormone involved in the stress response, but its effects are more long-term and include increasing blood sugar levels and suppressing the immune system. Thyroxin and insulin do not play a significant role in the immediate stress response.

The Primary Hormone Responsible for Physiological Stress Responses Such as Increased