The nervous system.
Liver
The brain is part of the nervous system, which controls or monitors all of the other organ systems.
There are many examples of organ systems, including the urinary system, the cardiovascular system, the nervous system, the digestive system, the respiratory system and the reproductive system.
The brain does not contain fixed macrophages. Instead, microglia serve as the resident macrophages in the brain.
brain
The brain is the most important organ of the nervous system. The spinal cord and the brain are the main parts of the nervous system but the spinal cord is not considered to be an organ.
The nervous system
Circulatory System.
The circulatory system
The brain belongs to the Nervous system. It is the only major organ in that system.nervous system
Sensory organ system
The brain