Health effects: Which systems are most affected by lead exposure?

• A. Digestive and respiratory systems
• B. Immune and endocrine systems
• C. Central and peripheral nervous system, cardiovascular system, and kidneys
• D. Skeletal and muscular systems

Answer: (C)

Lead exposure most affects the nervous system, kidneys, and cardiovascular system because lead directly interferes with nerve signaling and development, accumulates in the kidneys causing nephrotoxicity, and contributes to hypertension and other cardiovascular issues. The nervous system is especially vulnerable, with lead disrupting neurotransmitter release, calcium signaling, and myelin maintenance, leading to cognitive and behavioral problems in children and neuropathy in adults. The kidneys are a primary target because lead concentrates in renal tissue, impairing tubular function and overall kidney performance over time. Cardiovascular effects arise from long-term exposure and accompanying oxidative stress and renal dysfunction, increasing blood pressure and cardiovascular risk. While other systems can show effects (such as digestive symptoms or anemia), these three systems are the most consistently impacted by lead exposure.