What is the route of entry for adults?

What is the route of entry for adults?

• A. Ingestion
• B. Dermal contact
• C. Injection
• D. Inhalation

Answer: (D)

The main idea is how adults most often take in lead. For adults, inhalation of lead-containing dust and fumes is the primary route of entry. Tiny airborne particles are breathed into the lungs, where lead is absorbed into the bloodstream and distributed to organs and bone over time. While ingestion can occur (hand-to-mouth, contaminated food or water), it is typically not the dominant route for adults in real-world settings. Dermal exposure is minimal because lead does not absorb well through skin, and injection is not a common exposure route. So inhalation best explains how adults are exposed to lead in occupational and renovation contexts.

The main idea is how adults most often take in lead. For adults, inhalation of lead-containing dust and fumes is the primary route of entry. Tiny airborne particles are breathed into the lungs, where lead is absorbed into the bloodstream and distributed to organs and bone over time. While ingestion can occur (hand-to-mouth, contaminated food or water), it is typically not the dominant route for adults in real-world settings. Dermal exposure is minimal because lead does not absorb well through skin, and injection is not a common exposure route. So inhalation best explains how adults are exposed to lead in occupational and renovation contexts.