A small injected dose of a pathogen that stimulates the production of antibodies is:

• histamine
• interferon
• pathogen
• vaccine

An organism that enters a life form and causes disease or sickness is a/an:

• macrophage
• pathogen
• vaccine
• flu

A type of cell that "digests" pathogens is known as a/an:

• helper T cell
• macrophage
• suppressor T cell
• plasma cell

This gland, located anterior to the heart, but posterior to the sternum, is the lymphatic site where T cells are produced and mature:

• tonsils
• trachea
• thymus
• thalamus

A type of T cell that destroys infected cells is a:

• cytotoxic T cell
• helper T cell
• memory T cell
• suppressor T cell

HIV is spread by

• intravenous drug use

• sexual contact

• contact with infected blood.

• all of the above

What triggers the production of

antibodies

• an antigen

• an antibody

• phagocytes

In __________ immunity, antibodies are produced after having encountered a pathogen or antigen.

• passive
• active
• direct
• indirect

________ immunity results when antibodies from another organism are put inside your body to help fight pathogens.

• Active
• Passive
• Direct
• Indirect

What are the bean-like structures that filter lymph and store lymphocytes?

• lymph nodes

• GALT

• tonsils

• thymus