The different parts of the immune system and its cell types are explained. Also described are the three kinds of immunity humans have - adaptive, innate and passive - as well as the major types of disorders of the immune system.

The human body requires a multilayered immune system to keep it running smoothly. The two main classes of the immune system are the innate immune system and the adaptive immune system, or "acquired immunity". This article discusses the...

The human immune system has various ways of responding to an infection caused by bacteria or viruses. Our bodies produce proteins (antibodies) that are highly specific for the infectious agent as a part of our "humoral" immune response....

There are battles that are fought each day on the planet. The invading forces are those of viruses and bacteria. Left alone they would take over and destroy every cell! It is up to some key defense systems to battle and destroy these...

An in-depth look at cancer and the human body. Learn about cancer on a cellular level, types of cancer, how genetics and lifestyle risk factors play a part in cancer growth, and much more.