lo: swbat understand and explain how our body comes under attack. dn: list some ways in which you...
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LO: SWBAT understand and explain how our body comes under attack.
DN: List some ways in which you can get sick. What causes you to be sick?
HW: Article Summary Due Friday
What is wrong?
Disease-
•the body is not working as it should
•The body is not in homeostasis
What is the common theme?
Disease in humans may result from
foreign invader organisms called…..
PATHOGENS
Pathogen: any disease causing organism
Pathogens
• Bacteria
• Viruses
• Fungi
• Parasites
Bacteria Characteristics
• Prokaryotes• Unicellular organisms• Lack most ORGANELLES, no
true nucleus.
Examples
• Strep throat• Salmonella – toxins
• Syphilis
What will the doctorGive you?
Antibiotics
Virus• A VIRUS IS NOT A CELL (IT IS NOT
ALIVE)• DNA or RNA + Protein Coat• Very small, smaller then a CELL.• They can only reproduce INSIDE a cell.• A virus works by injecting its DNA into a cell,
turning the cell into a virus producing factory.
Examples• HIV
• Chicken Pox• Influenza
• Can you take antibiotics?
Antibiotics will not work on a virus- they are specific for
bacteria.
Fungus
• Athlete’s foot• Ring worm
• What can the doctorPrescribe?
• Fungicides
Parasites Organisms that feed off of other organisms
Examples: tapeworm, heartworm, trypanosoma, toxocara
Host: The organisms that the pathogen is living/feeding off of
Vector: What is transmitting the pathogen.
A vector could be living or nonliving.Examples: other animals, insects, water, desk
How are pathogens transmitted?
Blood
FoodSex
AirAnimal
Diagnosing – determine the disease you have
Diagnosis is made based on symptoms , examination and
testing
Prevention vs. TreatmentPrevention – ways to avoid getting the disease.
Treatment – ways to help people with a disease to get better.
Besides pathogens, what else can cause disease?
Organ MalfunctionToxic Substances Inherited
Disorder
Risky PersonalBehavior
Poor Nutrition
Zoonotic Diseases
•A disease of animals that is transmissible to humans
•Ex:–West Nile Virus–Rocky Mountain Spotted Fever–Hookworm–Toxoplasmosis
Epidemic
Sharp rise in incidence of an infection or disease
PandemicVery widely distributed epidemic
Endemic
Normally present in a certain geographic area or part of an area