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

This refers to the type of immunity developed from exposure to a pathogen:

• active acquired immunity
• passive acquired immunity
• innate immunity
• attenuated immunity

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

Signs of an inflammatory reaction include redness, swelling, heat, and itch.

• TRUE
• FALSE

__________ found in certain areas such as the base of the neck and the armpit.

• Lymph nodes

• Tonsils

• Thymus

• adenoids

In lymph nodes

• white blood cells mature into T cells.

• lymph drains back into the circulatory system.

• old and damaged red blood cells are destroyed.

• B and T cells gather and attach to foreign antigens.

The lymphatic system

• controls blood clotting.

• contains red blood cells.

• has vessels with thick, muscular walls.

• contains phagocytic cells.