Which of the following systems is NOT affected by lead exposure?

The respiratory system is generally not impacted by lead exposure in the same direct manner as the other systems listed. Lead mainly affects the nervous system, kidneys, and gastrointestinal tract.

The nervous system can suffer from lead poisoning, which can lead to cognitive deficits, behavioral issues, and motor impairment. The kidneys are affected as well, with lead exposure potentially leading to nephrotoxicity and impaired renal function. The gastrointestinal system can experience symptoms such as abdominal pain, cramps, and constipation arising from lead exposure.

In contrast, while inhalation of lead dust can occur in certain environments, the respiratory system does not typically experience the same degree of damage or disruption from lead as the other systems do. When considering systemic lead toxicity, the primary concerns tend to rest with neurological, renal, and gastrointestinal effects, making the respiratory system less prominently affected.