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Env410 Toxicology Worksheet

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University of Phoenix Material

Toxicology Worksheet

1. Identify the different resources available for your learning in this course.

Available resources during this course includes two textbooks; “Introduction to ecotoxicology,” and “A textbook of modern toxicology.” Additional resources include various videos, complimentary transcripts to the videos, supplemental readings, the UOP online Library, and web searches.

2. Define toxicology.

Toxicology is defined as that branch of science dealing with poisons. According to Hodgson (2010), a “poison can be defined as any substance that causes a harmful effect when administered, either by accident or by design, to a living organism” (p. 3). Toxicology also includes the study …show more content…

Steep slope elicit toxicity, whereas, shallow slopes elicit nonspecific toxicity. The dose-response line also allows one to estimate the threshold dose, by defining the lowest dose expected to elicit a response. The threshold dose is one that is lower than the greatest dose at which no affect is detected. This is generally between segments I and II (Hodgson, 2010).

7. What role do they play in environmental toxicology?

This helps put toxins into exposure classes. This allows scientist to determine what level the toxins are lethal, or what levels may help prevent undesired medical conditions, such as cancer. These levels are used for regulatory purposes as well, to minimize exposure to harmful toxins and their effects on human health and the environment (Hodgson, 2010).

8. Explain LD50.

LD50 refers to the dose level (concentration level) of a toxic substance (poison) required to obtain a lethal dose that kills 50% of a population under stated conditions, such as the controlled variables of the study. This level is typically normalized to the weight of the animal (milligram chemical/kilogram body weight), and the measure of acute toxicity is used to assign of toxicity to the given chemical (Hodgson, 2010).

9. Explain LD10.

LD10 refers to the dose level (concentration level) of a toxic substance (poison) required to obtain a lethal dose that kills 10% of

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