They are called reflexes. Reflexes are quick, protective reactions that occur within your nervous system. They are involuntary actions, meaning that they happen regardless of whether you want them to happen or not. They represent reactions to a certain stimulus.
All of us has reflexes and we don't even think about it, we just do it since it protect us from danger, like how someone will block a attack with a arm when getting attacked out of nowhere, it's an reflex
