Chapter 8 - Chapter 8 Notes: Environmental Health and...

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Chapter 8 Notes: Environmental Health and Toxicology Main Questions: 1. How have deaths due to disease changed through time? 2. What are some emerging diseases and what are their causes? 3. How is disease affected by ecosystems and ecology? 4. What kind of toxins are present in the environment? How do they work? 5. How common are toxins in the environment and how do they move through the environment? Health - A state of complete physical, mental, and social well-being. Disease - A deleterious change in the body’s condition in response to an environmental factor. Morbidity (illness) Mortality (death). Infectious Disease -Communicable diseases are still responsible for about 1/3 of all disease-related deaths. Emergent disease is one never known before, or has been absent for at least 20 years. Toxicology Dangerous chemicals are divided into two broad categories: Toxic - Poisonous - Can be general or very specific. Often harmful even in dilute concentrations. Hazardous - Dangerous - Flammable, explosive, irritant, acid, caustic. Allergens - Substances that activate the immune system. Antigens - Allergens that are recognized as foreign by white blood cells
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Chapter 8 - Chapter 8 Notes: Environmental Health and...

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