Download White Blood Cell

Allergy – Abnormal reaction of the immune system to a substance that is
harmless.
Antibody – A protein made by white blood cells that tag invaders for
destruction by the immune system.
Antigen – Any substance that triggers an immune system response. An
antigen can be a microbe, part of a microbe, or any other material foreign to
the body.
Bacteria – A simple form of microorganism; it does not have a nucleus; it
has a nucleoid.
Defenses – The body has many defenses that will keep out germs.
Examples include mucus and hairs in the nose and saliva in the mouth.
Diabetes – There are two types – Type 1 is caused by the immune system
mistakenly attacking the body. Type 2 is frequently caused by being
overweight.
Foreign Substance – Something that enters the body that does not belong
there.
Hay Fever – An allergy to pollen and rag weed.
HIV – A virus that weakens the immune system; the immune system can no
longer fight diseases.
Immune system – The body’s defense system; protects against infections
and foreign substances (parts of a germ can trigger the immune system).
There are billions of cells in the immune system. Another way to look at the
immune system is that it gobbles up germs cells.
Infection – A germ enters the body and begins to reproduce, making the
person sick.
Insect Bites – Microbes can enter the body when an insect bites a person.
Invaders – Things that enter the body from outside.
Measles – A disease caused by a virus, usually in children. It causes a red,
blotchy rash. It can be prevented with a vaccine.
Microbes – Another term for microorganisms.
Microscope – A tool used to see microorganisms.
Mucus – A slimy substance in the nose that traps microbes; also known as
snot.
Mucus membranes – Mucus moistens membranes to catch germs.
Mutate – A microbe changes its make-up; it makes it difficult to kill with
existing vaccines and antibiotics.
Nucleus – The brain of the cell; is usually found in the center of the cell.
Pathogens – Microorganisms that cause diseases.
Remember – What the immune system does after it has fought against a
germ; it will recognize it the next time it enters the body.
Saliva – A liquid produced by glands in the mouth; it helps kill germs.
Sneeze – The body forcefully ejecting germs out of the body; sounds like
“Ah-Choo!”
T-Cells – White blood cells that recognize and attach cells of the body that
contain bacteria and viruses. T-Cells also release chemicals that
communicate the presence of a pathogen. T-Cells are killed by HIV.
Vaccination – A shot that is given to a person to increase the chance a
person will not get a disease.
White Blood Cell – A type of white blood cells that defend the body against
disease and infection. Leukocytes and lymphocytes are types of white blood
cells.