Comprehensive Toxicology and
Environmental Health Concepts for
Students- COMPLETE EXAM STUDY GUIDE
2026/2027 WITH VERIFIED ANSWERS |
NEWEST VERSION
What is the modern definition of toxicology?
The study of the adverse effects of chemical, physical, or biological agents on living organisms
and the ecosystem, including the prevention and mitigation of such adverse effects.
What is toxinology?
A specialized area of toxicology that focuses on microbial, plant, and animal venoms, poisons,
and toxins.
Define toxicity.
The degree to which a substance can harm humans or animals.
What are the three types of toxicity?
Acute, subchronic, and chronic.
What are chemical agents?
Substances with distinct molecular compositions, such as chlorine gas (Cl2).
What are physical agents?
Non-chemical factors or forces like heat, radiation, or pressure, such as ultraviolet (UV)
radiation.
What are biological agents?
Living organisms or substances produced by living organisms, such as botulinum toxin.
What is the difference between a toxin and a toxicant?
, A toxin is produced by biological systems; a toxicant is produced by human activities or is a by-
product of them.
What is an example of a toxin?
Tetrodotoxin.
What is an example of a toxicant?
Mercury.
What is a dose?
The amount of a substance administered at one time.
What does 'the dose makes the poison' mean?
It implies that the toxicity of a substance is dependent on the amount administered.
What is LD50?
The lethal dose required to kill 50% of a population.
What is xenobiotics?
Foreign substances taken into the body that may produce beneficial effects or be toxic.
What are the routes of exposure to toxicants?
Injection, ingestion, inhalation, and dermal contact.
What are the eleven organ systems affected by toxicants?
Integumentary, skeletal, muscular, nervous, endocrine, digestive, respiratory, urinary,
reproductive, circulatory, and lymphatic.
What is bioavailability?
The fraction of a dose available for absorption.
What factors affect bioavailability?
Time and frequency of exposure, route of administration, dose, host-related factors, and the
physical and chemical form of the toxicant.
What is the role of the Institutional Animal Care and Use Committee (IACUC)?
To review and ensure the humane care and use of animals in research.
What does the Institutional Review Board (IRB) do?
Environmental Health Concepts for
Students- COMPLETE EXAM STUDY GUIDE
2026/2027 WITH VERIFIED ANSWERS |
NEWEST VERSION
What is the modern definition of toxicology?
The study of the adverse effects of chemical, physical, or biological agents on living organisms
and the ecosystem, including the prevention and mitigation of such adverse effects.
What is toxinology?
A specialized area of toxicology that focuses on microbial, plant, and animal venoms, poisons,
and toxins.
Define toxicity.
The degree to which a substance can harm humans or animals.
What are the three types of toxicity?
Acute, subchronic, and chronic.
What are chemical agents?
Substances with distinct molecular compositions, such as chlorine gas (Cl2).
What are physical agents?
Non-chemical factors or forces like heat, radiation, or pressure, such as ultraviolet (UV)
radiation.
What are biological agents?
Living organisms or substances produced by living organisms, such as botulinum toxin.
What is the difference between a toxin and a toxicant?
, A toxin is produced by biological systems; a toxicant is produced by human activities or is a by-
product of them.
What is an example of a toxin?
Tetrodotoxin.
What is an example of a toxicant?
Mercury.
What is a dose?
The amount of a substance administered at one time.
What does 'the dose makes the poison' mean?
It implies that the toxicity of a substance is dependent on the amount administered.
What is LD50?
The lethal dose required to kill 50% of a population.
What is xenobiotics?
Foreign substances taken into the body that may produce beneficial effects or be toxic.
What are the routes of exposure to toxicants?
Injection, ingestion, inhalation, and dermal contact.
What are the eleven organ systems affected by toxicants?
Integumentary, skeletal, muscular, nervous, endocrine, digestive, respiratory, urinary,
reproductive, circulatory, and lymphatic.
What is bioavailability?
The fraction of a dose available for absorption.
What factors affect bioavailability?
Time and frequency of exposure, route of administration, dose, host-related factors, and the
physical and chemical form of the toxicant.
What is the role of the Institutional Animal Care and Use Committee (IACUC)?
To review and ensure the humane care and use of animals in research.
What does the Institutional Review Board (IRB) do?
