Immune system
The immune system is an effective network of organs, special cells, tissues and proteins which constantly fight against the foreign invaders that can cause damage to our body. Immune response is a series of steps that our immune system take to prevent our body from getting affected when any foreign substance enter our body. The working of our immune system can be easily identified. The formation of pus or inflammation that happens when there is a cut in part of the skin is best seen example of the proper working of our immune system. It is when our immune system gets weak; we are affected by diseases and often require antibiotics to kill the disease causing microbes.