The Army System, The Immune System
The Immune system protects all the system. We are looking at 2 in particular.
How do circulatory and immune system work together?
The immune system sends white blood cells to the circulatory/cardiovascular system to help protect from germs bacteria viruses.
How does the nervous system and the immune system work together?
The nervous system tells the immune system to fight off disease and the immune system protects the nervous system from disease.