Instant Access To 100,000+ Essays!

- The word immune literally means “protection.” - Protection from many hazards in the environment. - Diseases cannot be immunized, such as cancer or AIDS - Immune system protects against foreign substances, and problems that may arise during that process - Cells of the immune system function to protect the individual organism against threats from anything that is foreign, or nonself. - Predominant threat to humans is infectious - invasion of the body by foreign organisms, viruses, bacteria, and fungi - Potential to cause disease - Disease results when cells tissues have been damaged so much that they can no longer function properly - Without an immune system humans would