The immune system is a complex network of cells and other compounds that defends our body against viruses and bacterial infections. It keeps a record of every microorganism it has ever defeated through the years. Therefore, it is able to identify and destroy the micro-organisms quickly if they enter our body again or it will put up a good fight against them. When our immune system is weak it cannot fulfil its role of defending us from the germs, bad bacteria and toxins.
