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