|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 Respiratory Diseases:
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