Which health effect is manifested when an injury or disease occurs only after an extensive period of time?
Atrazine is one of the most widely used agricultural pesticides in the U.S. that may be applied before and after planting to control broadleaf and grassy weeds. It is used primarily on corn, sorghum, sugarcane, Christmas trees, and other crops. If the oral LD50 of Atrazine is 2,000 mg/kg, what is the oral lethal dose in ounces of this pesticide for a 190-lb pesticide applicator?
Below is a list of chemicals with their oral LD50 in mg/kg (rats). Select the substance that is MOST toxic to rats.
|DDT, 87 mg/kg|
|malathion, 885 mg/kg|
|carbaryl (sevin), 307 mg/kg|
|parathion, 3 mg/kg|
Aflatoxins are natural chemicals found in certain forms of mold that can grow on rice, grains, nuts and seeds, legumes, and spices like black pepper. Continued exposure to aflatoxins has been linked to liver damage in some individuals. What do you call a substance that can cause liver damage?
Asbestos is a naturally occurring mineral that has been used in a variety of building construction materials such as roofing shingles, floor tiles, pipe coverings, and as a fire retardant. Which of the following statements is FALSE regarding asbestos?
|Asbestos fiber size is greater than fine sand.|
|Lung cancer is a major health effect associated with asbestos exposure.|
|The typical latency period of mesothelioma is 20 to 40 years.|
|The most common form of asbestos is chrysotile. |
We come in contact with toxic substances every day. After reviewing the material in this unit, share with the class what you think are the two or three potentially most toxic substances that can enter our everyday lives. Do you think that the Occupational Safety and Health Administration (OSHA), the Environmental Protection Agency (EPA), the Consumer Product Safety Commission (CPSC), and/or businesses are doing enough to limit these potential exposures? Why, or why not?