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Ch. 14 Env Haz Pt. 3
Environmental Ecology- Environmental Hazards & Human Health
Term | Definition |
---|---|
How we evaluate chemical hazards | 1. Toxicology |
Toxicology | Science that studies the harmful effects of chemicals on living organism's and ecosystems. |
Toxicity | Quantitive measure of how harmful a substance is. |
Toxicity Depending Factors | 1. Dosage (quantity) 2. Genetic makeup of person exposed 3. Water Solubility 4. Fat Solubility 5. Resistance to breakdown 6. Bio-accumlation in body tissue & organs (liver) 7. Food chain accumulation 8. Chemical Interactions |
Synergy | Cumulative effects of toxic substances. Combined effects is grater than the sum of individual components. |
Acute Toxicity | Rapid, short lived effects. |
Chronic Toxicity | Permeant, long lasting effects. |
Smoking | 1 death per 6 seconds worldwide US, 1/2 million deaths/yr Lead to the production of 25 illness: 1. Heart Disease 2. Lung Cancer 3. Stroke 3 Respiratory Diseases: 1. Bronchitis 2. COPD 3. Emphysema Leading cause of preventable death worldwide. |
Emphysema | Effects lung's air sacks (alveoli) |
Risks with smoking | Passive Smoking |
Passive Smoking | Around someone who smokes. 30% higher risk of heart disease & lung cancer |