-reduce unnecessary use of antibiotics -reduce antibiotic use in livestock 17-3: What types of Chemical Hazards Do We Face? List the 5 most substances to human health: arsenic 2. lead 3. mercury 4. chloride 5. PCBs Describe the 3 major types of toxic agents: Carcinogens Mutagens Teratogens -causes cancer -causes mutations in DNA causes harm or birth defects to a fetus or embryo EX: arsenic, benzene, chloroform, formaldehyde, EX: some preservatives in EX: ethyl alcohol, lead, PCBs, UV light food formaldehyde, mercury, PCBs PCBs: What was it used for? A class of 200 chlorine containing compounds that were widely used as lubricants, hydraulic fluids, electrical insulators, ingredient in paints, fire extinquishers, fire retardants in fabrics, and pesticides. Why was it banned? Banned in 1977 by the US Congress because it has been linked to liver cancer and learning disabilities in children Why are PCBs still causing issues even after it has been banned? PCBs are persistent chemicals that breakdown very slowly and are fat soluble and can be biomagnified. Therefore, it can still be found in our soil, air, and water. Briefly describe how chemicals affect each of the body systems: Immune System Nervous System Endocrine System -some chemicals like -chemicals that are -Endocrine disruptors arsenic, methylmercury, neurotoxins can cause -some chemicals are HAA and dioxins weaken the behavioral changes, learning (hormonally active agents) immune system to the disabilities, retardation, ADD, that hormones that point where it can’t fight and paralysis impair reproductive off diseases development as well as physical disorders EX: atrazine, DDT, PCBs, BPA -some chemicals are hormone blockers Mercury: Where does it come from? Natural Sources- released from rocks, soil, volcanos Human Sources- coal burning power plants, waste incinerators, metal ore
-reduce unnecessary use of antibiotics -reduce antibiotic use in livestock 17-3: What types of Chemical Hazards Do We Face? List the 5 most substances to human health: arsenic 2. lead 3. mercury 4. chloride 5. PCBs Describe the 3 major types of toxic agents: Carcinogens Mutagens Teratogens -causes cancer EX: arsenic, benzene, chloroform, formaldehyde, PCBs, UV light -causes mutations in DNA EX: some preservatives in food causes harm or birth defects to a fetus or embryo EX: ethyl alcohol, lead, formaldehyde, mercury, PCBs PCBs: What was it used for? A class of 200 chlorine containing compounds that were widely used as lubricants, hydraulic fluids, electrical insulators, ingredient in paints, fire extinquishers, fire retardants in fabrics, and pesticides. Why was it banned? Banned in 1977 by the US Congress because it has been linked to liver cancer and learning disabilities in children Why are PCBs still causing issues even after it has been banned? PCBs are persistent chemicals that breakdown very slowly and are fat soluble and can be biomagnified. Therefore, it can still be found in our soil, air, and water. Briefly describe how chemicals affect each of the body systems: Immune System Nervous System Endocrine System -some chemicals like arsenic, methylmercury, and dioxins weaken the immune system to the point where it can’t fight off diseases -chemicals that are neurotoxins can cause behavioral changes, learning disabilities, retardation, ADD, and paralysis -Endocrine disruptors -some chemicals are HAA (hormonally active agents) that hormones that impair reproductive development as well as physical disorders EX: atrazine, DDT, PCBs, BPA -some chemicals are hormone blockers Mercury: Where does it come from? Natural Sources- released from rocks, soil, volcanos Human Sources- coal burning power plants, waste incinerators, metal ore
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