How Adrenaline Works

Glucose is released by the liver to help the muscles work
Breathing gets faster so that extra oxygen can transform the glucose into energy
The heart beats faster to get the oxygen to the muscles
Blood is diverted away from the digestive system
Muscles tense ready for action
Skin changes occur due to the bodies increased activity e.g. red face/sweating
Blood drains away from the higher to the lower more instinctive part of the brain affecting rational thinking
The body is preparing for the fight or flight response