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EESA10H3 (542)
Lecture 9

Study Guide for Lecture 9: information from lecture slides + information added by prof during lecture

3 Pages
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Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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EESA10 – Human Health and the Environment
LECTURE 9
Slide: Toxicology
-Toxicology is the study of poisons from all sources (air, water, food, etc.)
-Poison – substance that causes harm and leads to harmful effects
Slide: Toxicology: assessing chemical hazards
-Not all chemicals cause the same level of harm, how harmful a substance is depends on
the chemical properties of the substance (electronegativity, polarity, oxidation state,
molecular weight, dissociation, solubility, etc.)
Slide: Toxicology: Receptor
-Receptor: the organism receiving the exposure or dose
-Receptor characteristics (frequency of exposure, age, general health, genetic makeup)
affect whether the receptor will develop the disease
Slide: Toxicology: Dose
-Dose: the amount of substance that a person has ingested, inhaled, or absorbed through
the skin
oAcute dose: causes acute effects, high dose of any chemical that someone has
been exposed to in a short period of time
oChronic dose: continuous exposure or repeated exposure to low levels of
contaminants, causes chronic effects
oLong-term: continuous low doses over a lifetime
Slide: Toxicology: Response
-Nonspecific response: there is no particular part of the body that experiences a particular
effect, whole body can be affected
oburning (destruction of cells because of exposure to high concentration of strong
acid or base)
onarcosis (depression in sensory activity, reversible, caused by alcohols, ethers,
benzene)
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Description
EESA10 Human Health and the Environment LECTURE 9 Slide: Toxicology - Toxicology is the study of poisons from all sources (air, water, food, etc.) - Poison substance that causes harm and leads to harmful effects Slide: Toxicology: assessing chemical hazards - Not all chemicals cause the same level of harm, how harmful a substance is depends on the chemical properties of the substance (electronegativity, polarity, oxidation state, molecular weight, dissociation, solubility, etc.) Slide: Toxicology: Receptor - Receptor: the organism receiving the exposure or dose - Receptor characteristics (frequency of exposure, age, general health, genetic makeup) affect whether the receptor will develop the disease Slide: Toxicology: Dose - Dose: the amount of substance that a person has ingested,
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