Environmental Health and Toxicity- Reverse Lesson 1 Presented by Mrs. Perryman

Antibiotic and Pesticide Wheel

What does this concept mean for you? CBS News Report on Antibiotics

Toxic Chemicals Hazardous Means dangerous Toxins Are poisonous

We will not discuss these formally but be familiar with: Allergens Antigens Neurotoxins Mutagens Teratogens Fetal Alcohol Syndrome Carcinogens These may appear on the AP exam. I might include them in test questions (as part of the question), so be familiar with their meaning.

Movement, distribution and fate of toxins SolubilityWaterMost Prolific Often excreted Oil Uses carriers, stored

Bioaccumulation Natural process of an organism selectively absorbing and storing a great variety of molecules Organism could not survive with out this process Biomass

Biomagnification A chemical is stored in tissue and is transferred up the food chain Usually your oil/fat soluble toxins

Two visuals to help us with this! watch?v=E5P-UoKLxlA How does Pacman explain Bioaccumulation and Biomagnification? How does Pacman explain Bioaccumulation and Biomagnification?

Persistence Chemical remains for a very long time Directly related to the structure of the molecule. C-Cl combinations- not found in nature so no microbes have evolved to break them down so they remain in an ecosystem Example: Chloroflurocarbons

Chemical Interactions Antagonistic reactions- interfere with the intended effects OR stimulate the break down of a needed molecule. Example: Vitamin A, D and E can reduce the response an organism has to carcinogens Additive- occur together in an exposure

Synergistic Effect Interactions in which one substance exacerbates the effect of another Example: London's Killer Fog Killer Fog Part 2,3, 4,5 and 6 available on Youtube. They are interesting we will discuss this in more detail Second Semester.