29. Which of the following dose-response relationships is shown by human exposure to lead (which shares the same dose- response pattern exhibited by the heavy metal plutonium)? A. lead exhibits no threshold effects, since it causes toxicity even at the lowest doses B. lead exhibits a wide therapeutic index, with an LD-50 which is far below its TD-50 C. lead exhibits threshold effects, since it causes no toxicity at the lowest doses D. lead has an ED-50 (effective dose) which is higher than its TD-50 (toxic dose) E. lead has a TD-50 (toxic dose) which is higher than its LD-50 (lethal dose)

29. Which of the following dose-response relationships is shown by human exposure to lead (which shares the same dose- response pattern exhibited by the heavy metal plutonium)? A. lead exhibits no threshold effects, since it causes toxicity even at the lowest doses B. lead exhibits a wide therapeutic index, with an LD-50 which is far below its TD-50 C. lead exhibits threshold effects, since it causes no toxicity at the lowest doses D. lead has an ED-50 (effective dose) which is higher than its TD-50 (toxic dose) E. lead has a TD-50 (toxic dose) which is higher than its LD-50 (lethal dose)

Essentials of Pharmacology for Health Professions

7th Edition

ISBN:9781305441620

Author:WOODROW

Publisher:WOODROW

Chapter27: Drugs And Older Adults

Section: Chapter Questions

Problem 9CRQ

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