18 Questions
What is one major factor that influences toxicity as it relates to the exposure situation for a specific chemical?
Exposure duration
Which route of exposure generally results in the most rapid toxic response?
Inhalation
Why might an agent that acts on the central nervous system be less toxic when taken orally compared to inhalation?
Route of administration
Which route of administration would likely lead to the least potent toxic effect?
Dermal
What is a common factor that can account for individual susceptibility to a range of responses to toxic agents?
Genetic factors
Which route of exposure involves the gastrointestinal tract?
Ingestion
What is the most likely cause of prolonged muscular relaxation and apnea after succinylcholine administration?
Rapid metabolic degradation by plasma butyrylcholinesterase
Which factor largely determines whether a toxic effect on a tissue is reversible or irreversible?
Ability of differentiated cells to divide
Why are injuries to the central nervous system largely considered irreversible?
Inability of differentiated CNS cells to divide
Which characteristic distinguishes idiosyncratic reactions from other hypersensitivity responses?
Involvement of genetic polymorphisms
Why are some toxic effects of chemicals labeled as irreversible?
Inability of certain tissues like CNS to regenerate
What usually contributes to the irreversible nature of carcinogenic and teratogenic effects of chemicals?
Inability of mutated cells to be replaced
What term is used to describe the combined effects of two chemicals being much greater than the sum of the effects of each agent given alone?
Synergistic effect
When one substance does not have a toxic effect on a certain organ but enhances the toxicity of another chemical, this is known as:
Potentiation effect
Which type of antagonism occurs when two chemicals counterbalance each other by producing opposite effects on the same physiologic function?
Functional antagonism
Isopropanol, when administered with carbon tetrachloride, leads to a hepatotoxicity that is much greater than when it is given alone. This is an example of:
Potentiation effect
In toxicology, what do we call it when two chemicals administered together interfere with each other’s actions or one interferes with the action of the other?
Antagonistic effect
What term describes the occurrence when the combined effects of two chemicals are usually additive?
Additive effect
Explore the concept of idiosyncratic reactions in medicine through a classic example involving prolonged muscular relaxation and apnea after succinylcholine administration. Learn about the role of plasma butyrylcholinesterase in the metabolic degradation of succinylcholine and its implications for patient care.
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