Immune system is essential for our good health.
The immune system, is made up of special cells, proteins, tissues, and organs that defends people against germs. The immune system is the body's defense against infectious organisms and other invaders. Invades can also be known as pathogen. Pathogen causes infection or disease. The immune system has two lines of defense. The first line of defense is Skin,Mucus,sweat, and body oil. Second line of defense is the stomach and the Phagocytes. Phagocytes are cells which "eat" foreign germs to destroy them.