1. Your breathing speeds up, which helps get more oxygen throughout your body.
2. Your heart beats faster, which increases the flow of blood to carry more oxygen to your muscles.
3. Your muscles tense up, which prepares you to move quickly.
4. The pupils of your eyes get wider, which allows extra light for more sensitive vision.
5. Your digestion slows down, because digestion is an unneccssary activity during an emergency.
6. Blood sugar increases to provide more fuel for fighting or running.
