Exam 13: Immune System: Internal Defense

Immune responses depend on communication among cells, or _______.

_______ is the body's first line of defense against pathogens and other harmful substances.

_______ are important in destroying cancer cells and cells infected by viruses.

An _______ involves recognition of foreign molecules and an action aimed at eliminating them.

Mechanical and chemical barriers, as well as inflammation, are examples of _______ defenses.

_______ is not a clinical characteristic of inflammation.

_______ remain in lymph tissue for many years after an infection.

When individuals are exposed to a disease like viral hepatitis or anthrax, they can be injected with _______ to help protect them from the disease.

About 75% of the antibodies in the body are _______.

_______ is an example of the immune system overreacting to mild antigens.

Some complement proteins _______.

_______ is borrowed immunity, so its effects do not last.

_______ develops from exposure to antigens.

In allergic reactions, _______.

A molecule recognized as foreign by cells of the immune system is a(n) _______.

The principal warriors in specific immune responses are the trillion or so _______ stationed strategically in the lymph tissue.

Killer T cells _______.

_______ defense mechanisms include barriers that prevent pathogens from entering the body.

An antigen-antibody complex _______.

Interferons are cytokines that _______.