Test 2

What is Bisphenol A (BPA)
synthetic organic compound
What does BPA do?

  • leeches into food, air, water, our bodies
    • 93 percent of americans have it

 

  • BPA mimics bad estrogen

 

  • Causes cancer, nerve damage
    • Etremeley low doses

 

 

Environmental Health
Assesses environmental factors that influence human health and quality of life
Physical Hazard:
Occur naturally in environment 
Chemically Hazard:
Synthetic and natural chemicals
Biological Hazards

Result from ecological interactions

  • infectious disease 

Cultural Hazards:

 

Results from our lifestyle
Infectious Disease Kills how many p/year
14 million
Vector:
Host to transfer disease
Toxicology: 
Study of effects of poisonous substances on humans and other organisms 
Infectous Disease causes what % of the nations death?
50%
Toxicity:
The degree of harm a chemical can inflict
Toxicant:
Anything toxic to you
Environmental Toxicology 
deals with toxic substances that comes from or are discharged into the enviorment
Indoor Health Hazards

  • Modern Americans spend about 90% of lives indoor
  • Cigarette smoke and radon are leading indoor hazards and are the top 2 causes of lung cancer
  • Asbestos dangerous when inhaled
  • lead in pipes and gasoline
  • PBDE compund used for fire retardence in:
    • computers, television, furniture, plastics

Risk vs Reward

  • Chemicals have given us high standard of life
  • Industrial agriculture of food
  • Modern materials and converniances
  • Medical Advances

Toxins:
Toxic chemicals manufactored in the tissues of living organisms
Synthetic Chemicals in Enviorment

  • Babies born with chemicals in body
  • pesticides for insects and weeds find way into soil, air, and water – and into humans
  • Humans carry over 100s of industrial chemicals in our body

Organisms Defense

  • Organisms are used to natrual toxicans
  • Surface barriers – Skin, scales, feathers
    • ingestion
  • We can store toxins
    • defenses can be overloaded if levels get too high
  • No defense against synthetics

Different individuals respond to hazards differently

 

  • genetics can alter responses
  • people in poor health are more sensitive
  • sensitivity varies dependent on age and sex
  • EPA sets standards for response based on adults, not infants who are more sensitive

Acute exposure

  • High exposure for a short time
  • easy to recognize
  • stem from a distinct event
  • toxicty tests reflect effects of acute toxicity 

 

Chronic Exposure

  • Low exposure
  • More common
  • harder to detect
  • effects organs gradually

Persistance levels

  • some degrade quickly and become harmless
  • Some degrade and become more toxic
  • toxicants can degrade into simpler products

Toxicants in water

  • runoff concentrates contaminants in surface water
  • Waste water treatment plants release toxins, pharmaceuticals, and detoxification products
  • water soluble chemicals enter organisms through drinking and absorption

Geology
The study of the earths physical features, process, and history
Core:

Solid iron in the center

    • Molten iron in the outer core

Mantle

 

Thick layer of dense, elastic rock called the mantle

    • portion of upper mantle called asthesosphere contains soft rock, melted in some areas

lithosphere

harder rock above asthenosphere

    • contains mantle and the crust
      • Crust: brittle; low density, thin

Order from center layers of earth(5)

  1. inner core
  2. outter core
  3. lower mantle
  4. upper mantle
  5. crust