In 5 sentences describe how the immune system protects the body from the threat of disease

Some white blood cells, like macrophages, destroy and eat bacteria and damaged cells. The B cells produce antibodies, which can neutralize viruses, bacteria or toxic proteins in the blood and other body fluids. The T cells can trace microorganisms that leave the body fluids to invade cells. Each T killer cell carries receptors for one type of foreign substance, "antigen". T cells can bind to infected cells and kill them. This can prevent spread of the microorganism within the body. But how can the T cells specifically identify or "recognize" the infected cells?

answer; analogue situations

a progressive heart disease that affects pumping action of the heart muscles.