Adrenaline

Adrenaline is something like a special juice your body makes when you get excited or scared. It helps your body respond quickly so it can protect you when something unexpected or dangerous happens. For example, if you see a big dog running toward you, your body will make adrenaline to help you run away fast, or stand up to the dog to make it go away. Adrenaline also makes your heart beat faster, and it can even make your muscles work harder and faster, so you can react faster to a situation.