What does adrenaline do to your body?

Prepares for stress. Adrenaline, or epinephrine, is a chemical produced by your adrenal glands that helps you respond to episodes of severe stress. Epinephrine has dozens of effects, but overall it regulates how your heart beats and how you make extra energy available to deal with things like car accidents or other serious injuries. In cases of severe shock, patients can be treated with epinephrine.
Fight or flight. When adrenaline is released, you may have the following symptoms: sweating, palpitations, dilated pupils, dry mouth, constipation, lack of appetite, high blood pressure, anxiety, cold extremities, decreased urine flow, insomnia, dry nose.