Adrenaline is a chemical that basically prepares your body for "fight or flight". It gives you a brief increase in energy and in some cases strength so you can either fight what triggers it, or run away from it.
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Your respiratory system provides you with extra oxygen, which your circulatory system delivers to the parts of your body that need it. Your muscular system, in turn, works with your skeletal system to help you move- fast
It makes your vessels vasoconstrict (hope that's the right word, french translation ;), and your heart beat faster and stronger. (frequency and force of contractions)
It gives your body (who's in fight or flight mode) more oxygenated blood faster.
Adrenalin is secreted by (what else?) the adrenal glands located on top of the kidneys and it regulates the body's FIGHT or FLIGHT mechanism which is part of our survival instinct. It raises blood pressure, moves blood to the limbs and out of the organs for the moment of fear, excitement, rage, etc.
It has a very peculiar stimulating effect which some claim addictive and use as a way of understanding extremes athletes who constantly put their lives at risk.
Hope this helped!
Adrenaline is meant for the body to pick itself up quickly from an idle position. This is implemented mainly for survival reasons, however nowadays is mostly used for exercise and stress coping. The process is called "fight or flight syndrome".