Ch. 5 Lesson 4 How Does the Body Defend Itself?
Ch. 5Lesson 4
How Does the Body Defend Itself?
microorganisms• disease causing organisms
• so small can only be seen w/ microscope
body’s defenses against microorganisms
1. Skin
2. Breathing passages
3. Mouth
4. Stomach
pathogens
• organisms that cause some diseases
infectious disease
• disease that can pass from 1 organism to another
bacteria viruses
pathogens
microorganisms
Pictures Of Strep Throat
The red flecks indicate a bacterial infection.
Many cases of food poisoning are caused by harmful E. coli bacteria
Getting plenty of rest.
Getting plenty of exercise.
Washing your hands often.
Eating healthful foods.
How can some diseases be spread?Sheet Drawing of Observations
Sheet A
Sheet B
Sheet C
Sheet D
Year Person Discovery1796 Edward
Jennercreated smallpox vaccine
1854 Florence Nightingale
demanded Army hospitals be clean
1868 Louis Pasteur
showed micro-organisms cause disease
1882 Robert Koch
infectious disease caused by certain pathogen
1928 Alexander Fleming
made 1st antibiotic-penicillin
Discovery timeline
Edward Jenner
The hand of a person infected with cowpox
Florence Nighting
ale
Louis Pasteur
Robert Koch
Alexander Fleming
immune system
• helps protect you from pathogens
• incl. white blood cells
• produces antibodies to certain diseases
chicken poxchicken pox
antibody• chemical body makes to stop
pathogens from infecting other cells
• different antibody made for each pathogen
vaccine• kind of medicine that protects
you from a disease
• signals your immune system to make antibodies to a certain pathogen