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)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text: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)
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