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Scientists know that lead exposure during childhood harms the developing brain and nervous system, but it is not clear if childhood lead exposure has long-lasting effects on adult brain function. Changes in adult intelligence quotients â IQs â is a way to measure effects of lead and other neurotoxic substances.
Health Effects of Exposure to Lead. Lead has no known function in the human body. Infants and children are most sensitive to the harmful effects of lead because they are undergoing a period of rapid development and they absorb lead more easily and excrete it less efficiently than adults.