MoCA Health Practice Test

Heavy metal contaminants pose a greater risk to children primarily because their developing nervous systems are more vulnerable to toxic substances. During childhood, the brain and nervous system are undergoing significant growth and maturation. This development makes children particularly sensitive to neurotoxic effects, which can lead to lasting cognitive deficits, behavioral problems, and a variety of health issues.

The exposure to heavy metals, such as lead or mercury, can interfere with this critical brain development process. For instance, studies have shown that lead exposure can result in significant reductions in IQ and increases in attention-related problems in children. Their physiologic responses to these toxic metals differ from those of adults, making it imperative to protect them from environmental exposures.

While other factors, such as lower body weights or increased outdoor activity, may also contribute to children's overall vulnerability to contaminants, the key aspect is the critical development phase of their nervous system.