What are the fight or flight hormones released from?
The adrenal gland makes several important hormones. The medulla (inner portion) is responsible for releasing epinephrine, also known as Adrenaline - the "fight or flight" hormone. The outer portion, the cortex, broadly makes 3 hormones: mineralocorticoids (help retain water in the blood vessels by the kidney), sex hormones, and finally cortisol, needed to live.
you sympathetic system is activated because its the fight or flight. Your body will choose to either fight or flight. But besides that blood pressure rises and your heart beat will also change by increasing beats. I believe theres more behind all this, like hormones in blood that come into affect. But this is a good start.
Hormones often act or counteract to maintain relatively ideal conditions in the body. During stress (physical and mental) stress hormones are released. These stress hormones are antagonists to insulin; while insulin decreases blood sugar concentration, stress hormones are increasing it. That reaction is normal for fight or flight situations, and is counteracted/normalised by other hormones as the situation changes back to normal. In diabetics, however, the normalisation is less efficient, as they already have difficulties…
it is called an emergency hormone because during emergencies, it is secreted and therefore adrenaline rush happens which refers to an activity of the adrenal gland in a fight-or-flight response, when it is releasing adrenaline (epinephrine). Adrenalin is often referred to as 'emergency hormones' because they are released when a person feels excited. Thus it is this hormone that often give people the strength to do otherwise-impossible deeds and prevent emergencies.