* The nervous system is made up of cells called neurons. This is the system that controls your thoughts, movements, sensations, and many other bodily functions.

* Other systems in the body are not made up of neurons. For example, the circulatory system is made up of blood, blood vessels, and the heart, while the digestive system is made up of organs like the stomach, intestines, and liver.

Could you tell me which system you're interested in?