First Line of Defense
This organ forms a protective barrier around the body.
What is the skin?
These cells attack invading pathogens.
What are white blood cells?
These cells produce antibodies.
What are B cells?
Small bean-shaped structures that filter lymph fluid.
What are lymph nodes?
Protection from disease.
What is immunity?
This sticky substance traps germs in the nose and throat.
What is mucus?
Redness, swelling, heat, and pain describe this body response.
What is inflammation?
These cells destroy infected body cells.
What are T cells?
This organ filters blood and helps fight infection.
What is the spleen?
Immunity received from another source, such as mother to baby.
What is passive immunity?
Tiny hair-like structures that sweep mucus out of the respiratory tract.
What are cilia?
A rise in body temperature that helps fight infection.
What is a fever?
Proteins that attach to antigens to destroy pathogens.
What are antibodies?
This gland is where T cells mature.
What is the thymus?
A preparation of weakened or inactive pathogens.
What is a vaccine?
This acid in the stomach destroys many pathogens.
What is stomach acid?
White blood cells that “eat” pathogens.
What are phagocytes?
The marker found on pathogens that antibodies recognize.
What is an antigen?
The fluid that circulates through the lymphatic system.
What is lymph?
When the immune system attacks the body’s own cells.
What is an autoimmune disease?
These two body fluids contain enzymes that kill bacteria.
What are tears and saliva?
This system responds the same way to all pathogens.
What is the nonspecific immune response?
This type of immunity develops after exposure and creates memory cells.
What is active immunity?
These structures in the throat help trap pathogens.
What are tonsils?
An overreaction of the immune system to harmless substances.
What is an allergy?