How Does the Immune System Work to Make Human Body Remain Healthy
The following article will describe how the innate immune system and back-up immune system function to keep the human body remain healthy.
Innate immune system responds depends on a large number of immune cells which contain phagocyte and killer cells. Phagocytes can take effect by devouring and digesting those pathogenic foreign bodies which exist within the blood and tissues of human body. Killer cells can also disintegrate or crack bigger pathogenic foreign bodies that can’t be devoured by phagocytes into fragments or smaller granules to be devoured by phagocytes easily. By this way, those pathogenic foreign bodies of blood and cells can be cleared up so as to keep a clean environment within blood and tissues.
Besides the above two types of immune cells in innate immune system, it also includes megakaryocytes, mastocytes and antigen presentation cells as well as T cell and B cell. These immune cells work together to form a complete and well-cooperative innate system to keep the human body’s health.
However, if the amount of pathological foreign substances exceeds that clearance ability of innate immune system or the defense ability of the innate immune system declines, the human body suffers from disease. At that time, the back-up immune system is activated to cooperate with the innate immune system to defeat against the pathogens together.
After a period of together work, the foreign pathological substances will be eliminated completely. As a result, the human body recovers normal from the illness condition, which is called self-healing ability of human body.
When the human body recovers normal state, the back-up immune system will get back to rest state and the innate immune system begins to work dependently, which is referred as the immune restrictive ability of the human body.