The function of the immune system is to keep the body free of foreign organic and inorganic substances. It uses two types of defense systems for this purpose, a nonspecific and a specific response. Nonspecific Response . The non-specific defense is carried out in two ways. One non-specific defense is called phagocytosis , and it comes in two forms.
Granulocytes contain granules filled with toxic substances.
When granylocytes come into contact with an invader, they release the toxin, which attacks the invader. Macrophages sever several functions, including scavenging for worn-out cells and debris of the host body as well as foreign substances. They also release substances that initiate a specific immune response. The second non-specific immune response is inflammation after an injury. Blood cells in the area contract temporarily and then dilute to increase blood flow and warmth.