The immune system is composed of many interdependent cell types that collectively protect the body from bacterial, parasitic, fungal, viral infections and from the growth of tumor cells. Many of these cell types have specialized functions. The cells of the immune system can engulf bacteria, kill parasites or tumor
The human body is everything that makes up, well, you. The basic parts of the human body are the head, neck, torso, arms and legs. Image Gallery: The BioDigital Human – follow the link for more information on the human body. Body systems Our bodies consist of a number of
The Body’s First Line of Defense The immune system is a complex of organs–highly specialized cells and even a circulatory system separate from blood vessels–all of which work together to clear infection from the body. The organs of the immune system, positioned throughout the body, are called lymphoid organs.