in the short-run, the fight-or-flight response and the release of cortisol can improve the immune system, but the extended release of cortisol can weaken the immune system.
The adrenal glands release cortisol when a situation is deemed to be stressful. When faced with a stressor, the adrenal glands release the stress hormone cortisol, which gives people an energy boost and makes them more ready to act.
Therefore, response of flight or fight is a collection of physiological responses (increases in blood pressure, heart rate, breathing rate, and sweating) brought on by the sympathetic nervous system and the endocrine system when a person confronts a perceived threat
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