How the Immune System Works

The purpose of the immune system is to:

• help germs invade your body

• fight off sickness

• make your nose run

• give you stomach problems

The immune system is made up of:

• tissues

• organs

• cells

• all of the above

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As part of the immune system, what fights germs?

• red blood cells

• bones

• white blood cells

• veins

White blood cells are found in lots of places , including an organ in your body that filters blood and helps fight infections. What is this organ called?

• the heart

• the spleen

• the kidneys

• the brain

The four main types of germs are:

• viruses, bacteria, parasites, and fungi

• small, medium, large, and extra large

• mushrooms, vegetables, fruit, and meat

• white blood cells, red blood cells, veins, and arteries

Getting these when you're young helps your immune system fight off diseases:

• stickers

• bandages

• shots (immunizations)

• cough drops

To be "immune" means to what?

• that you are infected

• that you are bald

• that you will get sick

• that you are protected

When someone's immune system overreacts to something, it's called:

• an allergy

• a sneeze

• the measles

• overreactus maximus

Which of the following will NOT help your immune system?

• playing sports video games

• exercising

• eating healthy food

• regularly washing your hands