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
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

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