Chapter 17 Environmental Hazards and Human Health (Screencast)

Chapter 17: Environmental Hazards and Human Health

Concept 17-1
People face health hazards from biological, chemical, physical, and cultural factors, and from the lifestyle choices they make.

Five major types of hazards
•Biological: pathogens
•Lifestyle choices

Concept 17-2
In terms of death rates, the most serious infectious diseases are flu, AIDS, diarrheal diseases, malaria, and tuberculosis; most of these deaths occur in developing countries.

Concept 17-3
There is growing concern about chemicals that can cause birth defects and cancers and disrupt the human immune, nervous, and endocrine systems.

Concept 17-4A
Scientists use live laboratory animals, non-animal tests, case reports of poisonings, and epidemiological studies to estimate the toxicity of chemicals, but these methods have limitations.

Concept 17-4B
Many health scientists call for much greater emphasis on pollution prevention to reduce our exposure to potentially harmful candidates.

Concept 17-5
We can reduce the major risks we face if we become informed, think critically about risks, and make careful choices.

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