The brain is the most complicated organ in the human body. The brain is composed of a variety of different cell types that perform the necessary functions for life. The brain is the organ that controls our emotions, thoughts, and actions. The brain is the body's most complex organ. It controls our body and allows us interaction with the outside world. It is composed of different types of cell that work together in order to perform all functions necessary for life. The brain is responsible for thoughts, emotions and actions. It is responsible for our thoughts, emotions, and actions.