how adrenaline prepares your body for the 'fight or flight'response

your adrenal glands produce adrenaline when you are frightened,excited or angry. it prepares your body for action.

this leads to the 

fight or flight response. 

• it increases the breathing rate and depth to get more oxygen into your body and remove excess carbon dioxide.
• it increases the heart rate and volume, sending more Oxygen and food-rich blood to the muscles for respiration and removing more waste products.
• blood is diverted from the digestive system to the muscles.
• glycogen in the liver is converted to glucose in the blood
• mental awareness increases
• speed of reactions increases
• pupils dilate, making eyes more sensitive to movement.
• the body hair stands on end (useful to other species of mammals for making them look bigger).