Lead concentration in blood is considered alarming if it is -
A
30 $\mu g$/100 ml
B
4–6 $\mu g$/100 ml
C
10 $\mu g$/100 ml
D
20 $\mu g$/100 ml
The answer is C.
Solution
Lead is a toxic heavy metal that enters the body from leaded petrol exhaust, lead paints, batteries and contaminated water. It damages the nervous system (especially in children), kidneys and blood formation, since it inhibits enzymes of haem synthesis. Normal blood lead levels are only a few micrograms per 100 ml. A blood lead level of 10 $\mu g$/100 ml (10 $\mu g$/dL) has been taken as the level of concern; at or above this value harmful effects, especially on the mental development of children, begin, so it is considered alarming. So lead concentration in blood is considered alarming if it is 10 $\mu g$/100 ml.
ConceptAlarming blood lead level
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