Biology 2485B Study Guide - Final Guide: Nitrate, Atrazine, Arsenic
13 Apr 2018
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Toxicology: study of effects of chem hazards on humans. Toxicity: degree of harm toxicant can cause: depends combine effect of chem and dose, any substance harmful if in large quantities. Enviro toxicology: toxic substance that come from/discharge into enviro: carcinogen: cancer, mutagen: dna mutations, teratogen: overactive immune, neurotoxin: affect nervous, endocrine disrupters: interfere with endo system. Radon gas: seep from bedrock, breakdown of radioactive uranium (can get into home) Arsenical keratosis: carotene starts to grow on skin, result cancer. Ddt: synthetic chemical, pest effe(cid:272)ts (cid:449)ere(cid:374)"t tested a(cid:374)d (cid:449)ere sprayed e(cid:448)ery(cid:449)here. Enviro toxicant carried by water: runoff from large areas to small volumes of surface water: chem enter organism through drink/absorp. By air: pollutant carried to the poles, found in polar bears, pest drift: airborne transport. Toxicant persistent: some degrade quick others remain unaltered for decades (depend on temp, moist, sun) Ddt degrade into dde, still very toxic and persistent. Bioaccumulation: toxicant build up in animal with chronic exposure.
