The process starts with the phagocyte that stumbled upon the invader. While ingesting the enemy infiltrator, the phagocyte saves a few important features of the enemy. These features are called "antigens". The phagocyte presents these antigens to another cell in the immune system called a T lymphocyte or "T helper cell". These helper cells pass on information about the invading bacteria or virus to another type of lymphocyte called "B cells". These B cells are capable of secreting antibodies. Antibodies are like guided missiles that carry attacking receptors which are designed to destroy the invading bacteria or virus. Once the T and B cells reproduce, the immune system gears up for battle. Antibodies swarm to the invader


