Environmental Health

Question 1

1. In environmental health, the term toxin refers to a toxic substance that _______________.

[removed]		is naturally produced by a plant or animal
[removed]		occurs in the occupational setting
[removed]		results from human activity
[removed]		a man-made product introduced into the environment due to human activity

1 points

Question 2

1. In toxicity testing in rodents, the LD50 is a dose that is _______________.

[removed]		acutely fatal to 50 percent of test animals
[removed]		fatal to 50 percent of test animals within a 90-day period
[removed]		fatal to 50 percent of test animals after lifetime bioaccumulation

1 points

Question 3

1. Which of the following is not characteristic of a health impact assessment?

[removed]		It evaluates a site or activity as it is, rather than looking forward in time
[removed]		It includes social and economic factors in the assessment
[removed]		It incorporates input from community members

1 points

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Question 4

1. An exposure pathway connects _______________ to _______________.

[removed]		an exposure / a change in tissue structure or function
[removed]		inhalation / absorption
[removed]		the environmental source of a contaminant / the point of exposure