Environmental Ecology- Environmental Hazards & Human Health
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each of the black spaces below before clicking
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How we evaluate chemical hazards | 1. Toxicology
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Toxicology | Science that studies the harmful effects of chemicals on living organism's and ecosystems.
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Toxicity | Quantitive measure of how harmful a substance is.
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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
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Synergy | Cumulative effects of toxic substances.
Combined effects is grater than the sum of individual components.
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Acute Toxicity | Rapid, short lived effects.
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Chronic Toxicity | Permeant, long lasting effects.
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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.
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Emphysema | Effects lung's air sacks (alveoli)
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Risks with smoking | Passive Smoking
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Passive Smoking | Around someone who smokes.
30% higher risk of heart disease & lung cancer
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