1 / 15

Three categories of human health risks

Three categories of human health risks. physical biological chemical. Biological Risks. Infectious diseases- those caused b y infectious agents, known as pathogens. Examples: pneumonia and venereal diseases. Biological Risks.

stu
Download Presentation

Three categories of human health risks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Three categories of human health risks • physical • biological • chemical

  2. Biological Risks • Infectious diseases- those caused b y infectious agents, known as pathogens. • Examples: pneumonia and venereal diseases

  3. Biological Risks • Chronic disease- slowly impairs the functioning of a person’s body. • Acute diseases- rapidly impair the functioning of a person’s body.

  4. Historical Diseases • Plague • Malaria • Tuberculosis

  5. Emergent Diseases • HIV/AIDS • Ebola • Mad Cow Disease • Bird Flu • West Nile Virus

  6. Chemical Risks • Neurotoxins- chemicals that disrupt the nervous system • Carcinogens- chemicals that cause cancer • Teratogens- chemicals that interfere with the normal development of embryos or fetuses • Allergens- chemicals that cause allergic reactions • Endocrine disruptors- chemicals that interfere with the normal functioning of hormones in an animal’s body

  7. Dose-Response Studies • LD50- lethal dose that kills 50% of the individuals • ED50- effective dose that causes 50% of the animals to display the harmful but nonlethal effect

  8. Synergistic interactions- when two risks come together and cause more harm that one would. For example, the health impact of a carcinogen such as asbestos can be much higher if an individual also smokes tobacco.

  9. Routes of Exposure

  10. Bioaccumulation • bioaccumulation- an increased concentration of a chemical within an organism over time

  11. Biomagnification • Biomagnification- the increase in a chemical concentration in animal tissues as the chemical moves up the food chain.

  12. Persistence • Persistence- how long a chemical remains in the environment

More Related