Download Chapter Seven Fighting Against Diseases

VII. Chapter Seven Fighting Against Diseases
Lesson One: What Causes Communicable Diseases
Definition: A Disease that can be spread from one person to another
Causes (pathogens-germs)
Bacteria is one of the most common germs
Virus is the other most common germ
How do Certain Kinds of Bacteria Harm Your Body?
They are very small, a million will fit on a pinhead
Some are harmless and some are helpful
Small numbers of bacteria will not make you sick
Bacteria reproduce very quickly
Some diseases can be caused by different bacteria
How Do Viruses Harm Your Body?
Viruses are smaller than bacteria
They cause more illnesses than any other germ
Each different type of virus causes a different
disease
Lesson Two: How does Your Body Fight Communicable Diseases?
What are your first lines of defenses?
Your Body has 3 ways to defend itself
Skin- largest organ on your body 1st Line of
Defense
Mucus Membranes- Sticky liquid
Hairs or Cilia
Stomach acid
White Blood Cells- 2nd Line of Defense
Cells in the blood that attack germs
Antibodies- 3rd Line of Defense
They are tiny substances produced by white
blood cells The antibodies attach to the germ
Now the germs are harmless
EACH ANTIBODY CAN ONLY ATTACK
A SPECIFIC TYPE OF GERM
Once you get the germ, your body
remembers how to make the antibodies, you
are immune to the disease.
How do Vaccines give you immunity?
Once you have the disease your body knows how to
destroy it
A vaccine is an injection of a dead or weakened germ.
A healthy body then attacks the germ and now the body
knows how to defend itself against an attack of the same
kind of germ
What else helps fight Communicable diseases?
Antibiotics are medicines that can kill many kinds of
bacteria
Penicillin is the most common- discovered in 1928
Bread mold
What is AIDS?
Acquired Immunity Deficiency Syndrome
It is preventable
AIDS attacks the white blood cells(with out WBC then
can’t fight germs)
Lesson Three: What are Some Diseases of the Respiratory System?
Cough, Cold, watery eyes, runny nose most common
What causes a Cold?
The most common disease in America
Caused by the Rhino virus
Many other viruses cause colds too
When does Sinusitis Occur?
If the opening in the sinus cavity become blocked with mucus:
Sinusitis
Take care of yourself: Get rest, drink fluids take medicine and
eat properly
How do you get Influenza
Flu is more severe,
Headaches, nausea, dizziness, coughing
Sometime scientist can predict types of flu coming
What is Pneumonia
Inflammation of the lungs
Caused by bacteria and it is infectious
Symptoms include coughing fever, chest pain and noisy
breathing
What can cause sore throats?
Germs
Tonsils change get bigger or red and swollen (Pus, white)
Strep throat is caused by the streptococcus germ