Which term defines how a contaminant enters or contacts the body, such as ingestion, inhalation, or dermal exposure?

• A. The exposure point.
• B. The exposure route.
• C. The environmental fate and transport.
• D. The receptor population.

Answer: (B)

Exposure route describes the pathway by which a contaminant enters or contacts the body. It includes ingestion, inhalation, and dermal contact. This concept matters for drinking water because it tells you how people are exposed: ingestion is the primary route when drinking water is consumed, but inhalation (for example, from steam or aerosols) and dermal contact (during bathing or skin contact with contaminated water) can also contribute exposure. This route-focused idea is different from exposure point, which is where exposure occurs; environmental fate and transport, which explains how the contaminant moves and persists in the environment; and receptor population, which are the people who might be exposed. So the term that best fits the description is exposure route.