AP Environmental Science Chapter 17 (Human Health and Environmental Risks)
Any impaired function of the body with a characteristic set of symptoms. (Not by pathogens: Cardiovascular, Digestive, Cancer)
Those diseases caused by infectious agents known as pathogens. (Pneumonia, STD's)
Slowly impair the functioning of a person's body. (Heart disease, Cancer)
Rapidly impair the functioning of a person's body. (Ebola)
Infectious agents An organism that causes disease
When a pathogen causes a rapid increase in disease.
When an epidemic occurs over a large geographic region, such as the entire continent.
Caused by an infection from a bacteria that is carried by fleas. Fleas -> Rats ->Rodents ->Humans.
Caused by infection from any species of protists in the genus Plasmodium. The parasite lives in a mosquito and then matures in a human.
Highly contagious disease caused by bacteria that will primarily affect the lungs. Spread when a person coughs and expels the bacteria into the air. Can live in the air for hours until another person breathes it in.
Emergent Infectious Diseases
Infectious diseases that were previously not described or have not been common for at least the prior 20 years.
Acquired Immune Deficiency Syndrome (AIDS)
In the late 1970's Rare types of pneumonia and cancer began appearing in individuals with weak immune systems.
Human Immunodeficiency Virus (HIV)
In 1983 scientists discovered the weak immune systems were caused by this virus. It was spread by sexual contact and sharing needles.
Ebola Hemorrhagic Fever
Disease caused by the Ebola virus.
Mad Cow Disease
Neurological Disease. Pathogen slowly damages a cow's nervous system.
Small beneficial proteins in brains of cattle which will occasionally mutate into deadly proteins that act as pathogens and subsequently cause mad cow disease.
Caused by the H1N1 virus (the one similar to humans) This will affect only birds.
West Nile Virus
Virus that is transmitted to birds by mosquitoes. Some species it is highly lethal to.
Chemicals that disrupt the nervous systems of animals. (Insecticides)
Chemicals that cause cancer.
Carcinogens that cause damage to the genetic material of a cell. (Mutate the cell) (Asbestos,Radon,Chemicals in Tobacco)
Chemicals that interfere with the normal development of embryos or fetuses. (Thalidomide,Alcohol)
Chemicals that cause allergic reactions. Not Pathogens. High response to the immune system. (Peanut, Milk, Penicillin)
Chemicals that interfere with the normal functioning of hormones in an animal's body. (Wastewater,Birth control Pills)
Expose animals or plants to different amounts of a chemical and then observe a variety of possible responses including mortality or changes in behavior or reproduction.
Experiments of Dose response studies that last for a short period of time.
Lethal Dose 50. Will kill 50% of the population.
Harmful effects that a chemical might have, including its acting as a teratogen, carcinogen or neurotoxin that could alter the behavior of the individual.
Effective Dose that causes 50% of the individuals to display the harmful, nonlethal effect.
Studies of toxicology that take place over long periods of time.
Field of science that strives to understand the causes of illness and disease in human and wildlife populations.
Monitor people who have been exposed to a chemical some time in the past.
Monitor people who might have become exposed to harmful chemicals in the future.
2 risks together cause more harm than one would expect based on their individual risks.
Routes of Exposure
The ways in which an individual might come in contact with a chemical.
How well a chemical can dissolve in a liquid
How long the chemical remains in the environment
Anything in the environment that can potentially cause harm.
Based on the philosophy that a potential hazard should not be considered a hazard until the scientific data proves that it is.
Made a list of 12 chemicals to be banned, phased out or reduced. (DDT, PCB's)
Registration, Evaluation, Authorization and Restriction of Chemicals.
Based on the philosophy that when a hazard is plausible but not yet certain, we should take actions to reduce or remove it.
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