We Measure Toxicity by the Dose at Which Adverse Effects

Multiple Choice

We measure toxicity by the dose at which adverse effects are produced. Which of the following statements about the dose of and response to toxic agents are true?

A) Lethal doses of particular toxicants for humans are known through doing laboratory tests on human subjects.
B) Doses are expressed in milligrams of toxicant per kilogram of body weight.
C) Sub-lethal doses usually produce acute toxicity whereas lethal doses produce chronic toxicity.
D) Response to a dose depends only on the type of toxicant and not the age or health of the organism.