Of the many systems working within the human body, the immune system is an excellent example of complex efficiency. A network of participating cells and organs, it synchronizes its responses when defending the body from infection and disease.
In its element, it has the capacity to remember diseases it has encountered and produce secretions and cells that can effectively defend the body from another recurrence. Moreover, it has an advanced communication system that can trigger an immediate response to an emergency and act according to the severity of the infection. Activated immune cells start producing substances that allow it to recruit other immune cells and guide it to the site of attack while at the same time allowing it to control behavior and growth.