What organ system is the brain in?

There are ten major organ systems in the body, each of which plays a different role in helping the body work. Circulatory System. This system is made up of the heart, blood, blood vessels, and lymphatics. It is the body’s delivery system, concerned with circulating blood to deliver oxygen and nutrients to every part of the body. Digestive System. The purpose of the digestive system is to turn the food you eat into something useful for the body. read more

The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. The brain is located in the head, usually close to the sensory organs for senses such as vision. The brain is the most complex organ in a vertebrate's body. read more