Well, answer is very simple. Biology is a study of life. Human brain system is one of the major systems in human life. Therefore, it is important. If you ask that Brain has any important role in human brain system. Then answer is given. The brain is important in the human body because it allows a person to think, feel and store memories, and it controls and coordinates the body’s actions and reactions, states the Atlanta Brain and Spine Care. The brain is an incredibly complex organ composed of many parts, including the cranium, the cerebrum, the brain stem and the cerebellum