Field Sanitation Certification Practice Test

Ingestion refers to the process of taking substances into the body through the mouth, which primarily occurs during eating or drinking. Drinking contaminated water is a direct example of ingestion because it involves consuming the liquid, potentially introducing harmful pathogens or chemicals into the gastrointestinal tract.

The other options do not represent ingestion: inhaling dust pertains to respiratory exposure, absorbing through the skin involves dermal contact, and being injected with a substance is a method of parenteral exposure. Understanding ingestion is crucial in the field of sanitation and health, as it highlights the importance of safe and clean drinking water to prevent disease transmission.